20492664 has 32 divisors (see below), whose sum is σ = 51342720. Its totient is φ = 6816096.

The previous prime is 20492653. The next prime is 20492669. The reversal of 20492664 is 46629402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20492669) 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, 20709 + ... + 21675.

It is an arithmetic number, because the mean of its divisors is an integer number (1604460).

Almost surely, 2^20492664 is an apocalyptic number.

20492664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20492664 is an abundant number, since it is smaller than the sum of its proper divisors (30850056).

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

20492664 is a wasteful number, since it uses less digits than its factorization.

20492664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859 (or 1855 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 20492664 is about 4526.8823709038. The cubic root of 20492664 is about 273.6525334302.

The spelling of 20492664 in words is "twenty million, four hundred ninety-two thousand, six hundred sixty-four".