20588693640 has 32 divisors (see below), whose sum is σ = 61766081280. Its totient is φ = 5490318272.

The previous prime is 20588693633. The next prime is 20588693663. The reversal of 20588693640 is 4639688502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85786104 + ... + 85786343.

It is an arithmetic number, because the mean of its divisors is an integer number (1930190040).

Almost surely, 2^20588693640 is an apocalyptic number.

20588693640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20588693640 is an abundant number, since it is smaller than the sum of its proper divisors (41177387640).

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

20588693640 is a wasteful number, since it uses less digits than its factorization.

20588693640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171572461 (or 171572457 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 51.

The spelling of 20588693640 in words is "twenty billion, five hundred eighty-eight million, six hundred ninety-three thousand, six hundred forty".