20490505752 has 16 divisors (see below), whose sum is σ = 51226264440. Its totient is φ = 6830168576.

The previous prime is 20490505751. The next prime is 20490505759. The reversal of 20490505752 is 25750509402.

It is a self number, because there is not a number n which added to its sum of digits gives 20490505752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20490505751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426885513 + ... + 426885560.

Almost surely, 2^20490505752 is an apocalyptic number.

It is an amenable number.

20490505752 is an abundant number, since it is smaller than the sum of its proper divisors (30735758688).

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

20490505752 is a wasteful number, since it uses less digits than its factorization.

20490505752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853771082 (or 853771078 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 20490505752 in words is "twenty billion, four hundred ninety million, five hundred five thousand, seven hundred fifty-two".