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20303872 = 2124957
BaseRepresentation
bin100110101110…
…1000000000000
31102012112200021
41031131000000
520144210442
62003103224
7334402651
oct115350000
942175607
1020303872
1110508666
126971b14
13428b834
1429a7528
151bb0e67
hex135d000

20303872 has 26 divisors (see below), whose sum is σ = 40610978. Its totient is φ = 10149888.

The previous prime is 20303809. The next prime is 20303887. The reversal of 20303872 is 27830302.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19501056 + 802816 = 4416^2 + 896^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1618 + ... + 6574.

Almost surely, 220303872 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 20303872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20305489).

20303872 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20303872 is an frugal number, since it uses more digits than its factorization.

20303872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4981 (or 4959 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20303872 is about 4505.9818020050. The cubic root of 20303872 is about 272.8095833442.

The spelling of 20303872 in words is "twenty million, three hundred three thousand, eight hundred seventy-two".

Divisors: 1 2 4 8 16 32 64 128 256 512 1024 2048 4096 4957 9914 19828 39656 79312 158624 317248 634496 1268992 2537984 5075968 10151936 20303872