20201864 has 32 divisors (see below), whose sum is σ = 41256000. Its totient is φ = 9237312.

The previous prime is 20201849. The next prime is 20201891. The reversal of 20201864 is 46810202.

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, 2117 + ... + 6699.

It is an arithmetic number, because the mean of its divisors is an integer number (1289250).

Almost surely, 2^20201864 is an apocalyptic number.

It is an amenable number.

20201864 is an abundant number, since it is smaller than the sum of its proper divisors (21054136).

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

20201864 is a wasteful number, since it uses less digits than its factorization.

20201864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4637 (or 4633 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20201864 is about 4494.6483733436. The cubic root of 20201864 is about 272.3519449357.

The spelling of 20201864 in words is "twenty million, two hundred one thousand, eight hundred sixty-four".