20860990 has 16 divisors (see below), whose sum is σ = 37826352. Its totient is φ = 8282944.

The previous prime is 20860969. The next prime is 20861017. The reversal of 20860990 is 9906802.

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, 6244 + ... + 8983.

It is an arithmetic number, because the mean of its divisors is an integer number (2364147).

Almost surely, 2^20860990 is an apocalyptic number.

20860990 is a deficient number, since it is larger than the sum of its proper divisors (16965362).

20860990 is a wasteful number, since it uses less digits than its factorization.

20860990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15371.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 20860990 is about 4567.3832771074. The cubic root of 20860990 is about 275.2823106362.

The spelling of 20860990 in words is "twenty million, eight hundred sixty thousand, nine hundred ninety".