20502590 has 16 divisors (see below), whose sum is σ = 37128672. Its totient is φ = 8151264.

The previous prime is 20502589. The next prime is 20502631. The reversal of 20502590 is 9520502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4469 + ... + 7808.

It is an arithmetic number, because the mean of its divisors is an integer number (2320542).

Almost surely, 2^20502590 is an apocalyptic number.

20502590 is a deficient number, since it is larger than the sum of its proper divisors (16626082).

20502590 is a wasteful number, since it uses less digits than its factorization.

20502590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12451.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 20502590 is about 4527.9785776878. The cubic root of 20502590 is about 273.6967091834.

The spelling of 20502590 in words is "twenty million, five hundred two thousand, five hundred ninety".