20228979 has 16 divisors (see below), whose sum is σ = 28098720. Its totient is φ = 12929280.

The previous prime is 20228959. The next prime is 20228981. The reversal of 20228979 is 97982202.

It is not a de Polignac number, because 20228979 - 2⁸ = 20228723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20228959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12919 + ... + 14399.

It is an arithmetic number, because the mean of its divisors is an integer number (1756170).

Almost surely, 2^20228979 is an apocalyptic number.

20228979 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20228979 is a deficient number, since it is larger than the sum of its proper divisors (7869741).

20228979 is a wasteful number, since it uses less digits than its factorization.

20228979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20228979 is about 4497.6637268698. The cubic root of 20228979 is about 272.4737409817.

The spelling of 20228979 in words is "twenty million, two hundred twenty-eight thousand, nine hundred seventy-nine".