20513771740 has 96 divisors (see below), whose sum is σ = 54589506048. Its totient is φ = 6289056000.

The previous prime is 20513771717. The next prime is 20513771753. The reversal of 20513771740 is 4717731502.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20513771740.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15246 + ... + 203125.

It is an arithmetic number, because the mean of its divisors is an integer number (568640688).

Almost surely, 2^20513771740 is an apocalyptic number.

20513771740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20513771740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27294753024).

20513771740 is an abundant number, since it is smaller than the sum of its proper divisors (34075734308).

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

20513771740 is a wasteful number, since it uses less digits than its factorization.

20513771740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218459 (or 218457 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 37.

The spelling of 20513771740 in words is "twenty billion, five hundred thirteen million, seven hundred seventy-one thousand, seven hundred forty".