20525664 has 48 divisors (see below), whose sum is σ = 57053808. Its totient is φ = 6438912.

The previous prime is 20525657. The next prime is 20525671. The reversal of 20525664 is 46652502.

It is an interprime number because it is at equal distance from previous prime (20525657) and next prime (20525671).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

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, 4657 + ... + 7920.

It is an arithmetic number, because the mean of its divisors is an integer number (1188621).

Almost surely, 2^20525664 is an apocalyptic number.

20525664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20525664 is an abundant number, since it is smaller than the sum of its proper divisors (36528144).

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

20525664 is a wasteful number, since it uses less digits than its factorization.

20525664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12607 (or 12599 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 20525664 is about 4530.5257972999. The cubic root of 20525664 is about 273.7993451632.

The spelling of 20525664 in words is "twenty million, five hundred twenty-five thousand, six hundred sixty-four".