20974688 has 24 divisors (see below), whose sum is σ = 47193552. Its totient is φ = 8989056.

The previous prime is 20974687. The next prime is 20974691. The reversal of 20974688 is 88647902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20974687) 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, 46595 + ... + 47042.

It is an arithmetic number, because the mean of its divisors is an integer number (1966398).

Almost surely, 2^20974688 is an apocalyptic number.

20974688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20974688 is an abundant number, since it is smaller than the sum of its proper divisors (26218864).

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

20974688 is an equidigital number, since it uses as much as digits as its factorization.

20974688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93654 (or 93646 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 20974688 is about 4579.8130966230. The cubic root of 20974688 is about 275.7815256298.

The spelling of 20974688 in words is "twenty million, nine hundred seventy-four thousand, six hundred eighty-eight".