20243864 has 32 divisors (see below), whose sum is σ = 39852000. Its totient is φ = 9622272.

The previous prime is 20243863. The next prime is 20243879. The reversal of 20243864 is 46834202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20243863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49292 + ... + 49700.

It is an arithmetic number, because the mean of its divisors is an integer number (1245375).

Almost surely, 2^20243864 is an apocalyptic number.

It is an amenable number.

20243864 is a deficient number, since it is larger than the sum of its proper divisors (19608136).

20243864 is a wasteful number, since it uses less digits than its factorization.

20243864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707 (or 703 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 20243864 is about 4499.3181705676. The cubic root of 20243864 is about 272.5405556450.

The spelling of 20243864 in words is "twenty million, two hundred forty-three thousand, eight hundred sixty-four".