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20221236 = 22327292767
BaseRepresentation
bin100110100100…
…0110100110100
31102001100022200
41031020310310
520134034421
62001224500
7333610020
oct115106464
942040280
1020221236
1110461572
126932130
134260039
142985380
151b96726
hex1348d34

20221236 has 72 divisors (see below), whose sum is σ = 60453120. Its totient is φ = 5576256.

The previous prime is 20221231. The next prime is 20221259. The reversal of 20221236 is 63212202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5925 + ... + 8691.

Almost surely, 220221236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20221236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30226560).

20221236 is an abundant number, since it is smaller than the sum of its proper divisors (40231884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20221236 is a wasteful number, since it uses less digits than its factorization.

20221236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813 (or 2808 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20221236 is about 4496.8028642581. The cubic root of 20221236 is about 272.4389718284.

Adding to 20221236 its reverse (63212202), we get a palindrome (83433438).

The spelling of 20221236 in words is "twenty million, two hundred twenty-one thousand, two hundred thirty-six".

Divisors: 1 2 3 4 6 7 9 12 14 18 21 28 29 36 42 58 63 84 87 116 126 174 203 252 261 348 406 522 609 812 1044 1218 1827 2436 2767 3654 5534 7308 8301 11068 16602 19369 24903 33204 38738 49806 58107 77476 80243 99612 116214 160486 174321 232428 240729 320972 348642 481458 561701 697284 722187 962916 1123402 1444374 1685103 2246804 2888748 3370206 5055309 6740412 10110618 20221236