20479580 has 24 divisors (see below), whose sum is σ = 46917360. Its totient is φ = 7447040.

The previous prime is 20479579. The next prime is 20479583. The reversal of 20479580 is 8597402.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20479580.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20479583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46325 + ... + 46764.

It is an arithmetic number, because the mean of its divisors is an integer number (1954890).

Almost surely, 2^20479580 is an apocalyptic number.

20479580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20479580 is an abundant number, since it is smaller than the sum of its proper divisors (26437780).

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

20479580 is a wasteful number, since it uses less digits than its factorization.

20479580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93109 (or 93107 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20479580 is about 4525.4369954735. The cubic root of 20479580 is about 273.5942811693.

The spelling of 20479580 in words is "twenty million, four hundred seventy-nine thousand, five hundred eighty".