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20454621 = 31117192101
BaseRepresentation
bin100111000000…
…1110011011101
31102111012110120
41032001303131
520214021441
62010225153
7335601315
oct116016335
942435416
1020454621
1110600950
126a251b9
134312335
142a06445
151be0966
hex1381cdd

20454621 has 48 divisors (see below), whose sum is σ = 33576768. Its totient is φ = 10944000.

The previous prime is 20454619. The next prime is 20454641. The reversal of 20454621 is 12645402.

It is not a de Polignac number, because 20454621 - 21 = 20454619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20454591 and 20454600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20454641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 202471 + ... + 202571.

It is an arithmetic number, because the mean of its divisors is an integer number (699516).

Almost surely, 220454621 is an apocalyptic number.

It is an amenable number.

20454621 is a deficient number, since it is larger than the sum of its proper divisors (13122147).

20454621 is a wasteful number, since it uses less digits than its factorization.

20454621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20454621 is about 4522.6785205230. The cubic root of 20454621 is about 273.4830904837.

It can be divided in two parts, 2045 and 4621, that added together give a palindrome (6666).

The spelling of 20454621 in words is "twenty million, four hundred fifty-four thousand, six hundred twenty-one".

Divisors: 1 3 11 17 19 33 51 57 101 187 209 303 323 361 561 627 969 1083 1111 1717 1919 3333 3553 3971 5151 5757 6137 10659 11913 18411 18887 21109 32623 36461 56661 63327 67507 97869 109383 202521 358853 401071 619837 1076559 1203213 1859511 6818207 20454621