20879578 has 16 divisors (see below), whose sum is σ = 32455080. Its totient is φ = 10067200.

The previous prime is 20879567. The next prime is 20879591. The reversal of 20879578 is 87597802.

It can be written as a sum of positive squares in 4 ways, for example, as 9903609 + 10975969 = 3147^2 + 3313^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5868 + ... + 8728.

Almost surely, 2^20879578 is an apocalyptic number.

20879578 is a deficient number, since it is larger than the sum of its proper divisors (11575502).

20879578 is a wasteful number, since it uses less digits than its factorization.

20879578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2993.

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 20879578 is about 4569.4176871895. The cubic root of 20879578 is about 275.3640489835.

The spelling of 20879578 in words is "twenty million, eight hundred seventy-nine thousand, five hundred seventy-eight".