20501864 has 32 divisors (see below), whose sum is σ = 41057280. Its totient is φ = 9563904.

The previous prime is 20501861. The next prime is 20501867. The reversal of 20501864 is 46810502.

It is an interprime number because it is at equal distance from previous prime (20501861) and next prime (20501867).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20501861) 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, 16679 + ... + 17865.

It is an arithmetic number, because the mean of its divisors is an integer number (1283040).

Almost surely, 2^20501864 is an apocalyptic number.

It is an amenable number.

20501864 is an abundant number, since it is smaller than the sum of its proper divisors (20555416).

20501864 is a wasteful number, since it uses less digits than its factorization.

20501864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337 (or 1333 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20501864 is about 4527.8984087543. The cubic root of 20501864 is about 273.6934785972.

The spelling of 20501864 in words is "twenty million, five hundred one thousand, eight hundred sixty-four".