20087964 has 36 divisors (see below), whose sum is σ = 54685176. Its totient is φ = 6180768.

The previous prime is 20087953. The next prime is 20087989. The reversal of 20087964 is 46978002.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 20994 + ... + 21929.

Almost surely, 2^20087964 is an apocalyptic number.

It is an amenable number.

20087964 is an abundant number, since it is smaller than the sum of its proper divisors (34597212).

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

20087964 is a wasteful number, since it uses less digits than its factorization.

20087964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42946 (or 42941 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20087964 is about 4481.9598391775. The cubic root of 20087964 is about 271.8391313758.

The spelling of 20087964 in words is "twenty million, eighty-seven thousand, nine hundred sixty-four".