20879280 has 120 divisors (see below), whose sum is σ = 71727552. Its totient is φ = 5440512.

The previous prime is 20879251. The next prime is 20879303. The reversal of 20879280 is 8297802.

It is a tau number, because it is divible by the number of its divisors (120).

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 23 ways as a sum of consecutive naturals, for example, 33532 + ... + 34148.

Almost surely, 2^20879280 is an apocalyptic number.

20879280 is a gapful number since it is divisible by the number (20) 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 20879280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35863776).

20879280 is an abundant number, since it is smaller than the sum of its proper divisors (50848272).

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

20879280 is a wasteful number, since it uses less digits than its factorization.

20879280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 20879280 is about 4569.3850789794. The cubic root of 20879280 is about 275.3627389494.

The spelling of 20879280 in words is "twenty million, eight hundred seventy-nine thousand, two hundred eighty".