20500777431 has 32 divisors (see below), whose sum is σ = 31419555840. Its totient is φ = 13197492000.

The previous prime is 20500777399. The next prime is 20500777439. The reversal of 20500777431 is 13477700502.

It is not a de Polignac number, because 20500777431 - 2⁵ = 20500777399 is a prime.

It is a super-2 number, since 2×20500777431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500777439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 361081 + ... + 413981.

It is an arithmetic number, because the mean of its divisors is an integer number (981861120).

Almost surely, 2^20500777431 is an apocalyptic number.

20500777431 is a deficient number, since it is larger than the sum of its proper divisors (10918778409).

20500777431 is a wasteful number, since it uses less digits than its factorization.

20500777431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53404 (or 53398 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 36.

The spelling of 20500777431 in words is "twenty billion, five hundred million, seven hundred seventy-seven thousand, four hundred thirty-one".