20965400 has 24 divisors (see below), whose sum is σ = 48745020. Its totient is φ = 8386080.

The previous prime is 20965367. The next prime is 20965409. The reversal of 20965400 is 456902.

It is a self number, because there is not a number n which added to its sum of digits gives 20965400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20965409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52214 + ... + 52613.

Almost surely, 2^20965400 is an apocalyptic number.

20965400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20965400 is an abundant number, since it is smaller than the sum of its proper divisors (27779620).

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

20965400 is a wasteful number, since it uses less digits than its factorization.

20965400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104843 (or 104834 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20965400 is about 4578.7989691621. The cubic root of 20965400 is about 275.7408124776.

The spelling of 20965400 in words is "twenty million, nine hundred sixty-five thousand, four hundred".