20956600 has 48 divisors (see below), whose sum is σ = 55688400. Its totient is φ = 7184640.

The previous prime is 20956583. The next prime is 20956627. The reversal of 20956600 is 665902.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6085 + ... + 8884.

It is an arithmetic number, because the mean of its divisors is an integer number (1160175).

Almost surely, 2^20956600 is an apocalyptic number.

20956600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20956600 is an abundant number, since it is smaller than the sum of its proper divisors (34731800).

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

20956600 is a wasteful number, since it uses less digits than its factorization.

20956600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14992 (or 14983 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 20956600 is about 4577.8379176201. The cubic root of 20956600 is about 275.7022273369.

The spelling of 20956600 in words is "twenty million, nine hundred fifty-six thousand, six hundred".