20359557 has 12 divisors (see below), whose sum is σ = 31138380. Its totient is φ = 12774528.

The previous prime is 20359541. The next prime is 20359571. The reversal of 20359557 is 75595302.

It can be written as a sum of positive squares in 2 ways, for example, as 17715681 + 2643876 = 4209^2 + 1626^2 .

It is not a de Polignac number, because 20359557 - 2⁴ = 20359541 is a prime.

It is a super-2 number, since 2×20359557² = 829023122472498, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20359517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66382 + ... + 66687.

It is an arithmetic number, because the mean of its divisors is an integer number (2594865).

Almost surely, 2^20359557 is an apocalyptic number.

It is an amenable number.

20359557 is a deficient number, since it is larger than the sum of its proper divisors (10778823).

20359557 is a wasteful number, since it uses less digits than its factorization.

20359557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133092 (or 133089 counting only the distinct ones).

The product of its (nonzero) digits is 47250, while the sum is 36.

The square root of 20359557 is about 4512.1565797299. The cubic root of 20359557 is about 273.0587564230.

The spelling of 20359557 in words is "twenty million, three hundred fifty-nine thousand, five hundred fifty-seven".