20590590 has 16 divisors (see below), whose sum is σ = 49417488. Its totient is φ = 5490816.

The previous prime is 20590579. The next prime is 20590597. The reversal of 20590590 is 9509502.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 686353 = 20590590 / (2 + 0 + 5 + 9 + 0 + 5 + 9 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20590597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343147 + ... + 343206.

It is an arithmetic number, because the mean of its divisors is an integer number (3088593).

Almost surely, 2^20590590 is an apocalyptic number.

20590590 is an abundant number, since it is smaller than the sum of its proper divisors (28826898).

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

20590590 is a wasteful number, since it uses less digits than its factorization.

20590590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686363.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 20590590 is about 4537.6855333970. The cubic root of 20590590 is about 274.0877318650.

The spelling of 20590590 in words is "twenty million, five hundred ninety thousand, five hundred ninety".