20879424 has 112 divisors (see below), whose sum is σ = 63032640. Its totient is φ = 6773760.

The previous prime is 20879401. The next prime is 20879431. The reversal of 20879424 is 42497802.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74164 + ... + 74444.

Almost surely, 2^20879424 is an apocalyptic number.

20879424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20879424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31516320).

20879424 is an abundant number, since it is smaller than the sum of its proper divisors (42153216).

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

20879424 is a wasteful number, since it uses less digits than its factorization.

20879424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20879424 is about 4569.4008359959. The cubic root of 20879424 is about 275.3633719876.

It can be divided in two parts, 2087942 and 4, that added together give a triangular number (2087946 = T₂₀₄₃).

The spelling of 20879424 in words is "twenty million, eight hundred seventy-nine thousand, four hundred twenty-four".