20879658 has 12 divisors (see below), whose sum is σ = 45239298. Its totient is φ = 6959880.

The previous prime is 20879633. The next prime is 20879707. The reversal of 20879658 is 85697802.

It can be written as a sum of positive squares in only one way, i.e., 11716929 + 9162729 = 3423^2 + 3027^2 .

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 5 ways as a sum of consecutive naturals, for example, 579973 + ... + 580008.

Almost surely, 2^20879658 is an apocalyptic number.

20879658 is an abundant number, since it is smaller than the sum of its proper divisors (24359640).

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

20879658 is a wasteful number, since it uses less digits than its factorization.

20879658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159989 (or 1159986 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 20879658 is about 4569.4264410317. The cubic root of 20879658 is about 275.3644006684.

The spelling of 20879658 in words is "twenty million, eight hundred seventy-nine thousand, six hundred fifty-eight".