20603836957 has 16 divisors (see below), whose sum is σ = 23007232512. Its totient is φ = 18289116720.

The previous prime is 20603836933. The next prime is 20603836961. The reversal of 20603836957 is 75963830602.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20603836957 - 2²⁷ = 20469619229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20603836957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20603836457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2041638 + ... + 2051704.

It is an arithmetic number, because the mean of its divisors is an integer number (1437952032).

Almost surely, 2^20603836957 is an apocalyptic number.

It is an amenable number.

20603836957 is a deficient number, since it is larger than the sum of its proper divisors (2403395555).

20603836957 is a wasteful number, since it uses less digits than its factorization.

20603836957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14448.

The product of its (nonzero) digits is 1632960, while the sum is 49.

The spelling of 20603836957 in words is "twenty billion, six hundred three million, eight hundred thirty-six thousand, nine hundred fifty-seven".