20518570740 has 24 divisors (see below), whose sum is σ = 57451998240. Its totient is φ = 5471618848.

The previous prime is 20518570727. The next prime is 20518570747. The reversal of 20518570740 is 4707581502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20518570747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170988030 + ... + 170988149.

It is an arithmetic number, because the mean of its divisors is an integer number (2393833260).

Almost surely, 2^20518570740 is an apocalyptic number.

20518570740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20518570740 is an abundant number, since it is smaller than the sum of its proper divisors (36933427500).

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

20518570740 is a wasteful number, since it uses less digits than its factorization.

20518570740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341976191 (or 341976189 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 39.

The spelling of 20518570740 in words is "twenty billion, five hundred eighteen million, five hundred seventy thousand, seven hundred forty".