20640692588 has 12 divisors (see below), whose sum is σ = 36204635880. Its totient is φ = 10296510912.

The previous prime is 20640692581. The next prime is 20640692599. The reversal of 20640692588 is 88529604602.

It is a super-3 number, since 3×20640692588³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20640692581) 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, 5956898 + ... + 5960361.

It is an arithmetic number, because the mean of its divisors is an integer number (3017052990).

Almost surely, 2^20640692588 is an apocalyptic number.

It is an amenable number.

20640692588 is a deficient number, since it is larger than the sum of its proper divisors (15563943292).

20640692588 is a wasteful number, since it uses less digits than its factorization.

20640692588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11917696 (or 11917694 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 20640692588 in words is "twenty billion, six hundred forty million, six hundred ninety-two thousand, five hundred eighty-eight".