20867239988 has 12 divisors (see below), whose sum is σ = 41734480032. Its totient is φ = 8943102840.

The previous prime is 20867239973. The next prime is 20867239997. The reversal of 20867239988 is 88993276802.

20867239988 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 20867239988.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372629258 + ... + 372629313.

It is an arithmetic number, because the mean of its divisors is an integer number (3477873336).

Almost surely, 2^20867239988 is an apocalyptic number.

20867239988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20867239988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20867239988 is a wasteful number, since it uses less digits than its factorization.

20867239988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745258582 (or 745258580 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 62.

The spelling of 20867239988 in words is "twenty billion, eight hundred sixty-seven million, two hundred thirty-nine thousand, nine hundred eighty-eight".