20657152 has 22 divisors (see below), whose sum is σ = 41296178. Its totient is φ = 10328064.

The previous prime is 20657149. The next prime is 20657171. The reversal of 20657152 is 25175602.

It can be written as a sum of positive squares in only one way, i.e., 20647936 + 9216 = 4544^2 + 96^2 .

It is a super-2 number, since 2×20657152² = 853435857502208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20657152.

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, 9063 + ... + 11110.

It is an arithmetic number, because the mean of its divisors is an integer number (1877099).

Almost surely, 2^20657152 is an apocalyptic number.

It is an amenable number.

20657152 is a deficient number, since it is larger than the sum of its proper divisors (20639026).

20657152 is an equidigital number, since it uses as much as digits as its factorization.

20657152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20193 (or 20175 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 20657152 is about 4545.0139713757. The cubic root of 20657152 is about 274.3827566676.

The spelling of 20657152 in words is "twenty million, six hundred fifty-seven thousand, one hundred fifty-two".