20813260 has 24 divisors (see below), whose sum is σ = 47070576. Its totient is φ = 7684800.

The previous prime is 20813257. The next prime is 20813279. The reversal of 20813260 is 6231802.

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, 39766 + ... + 40285.

It is an arithmetic number, because the mean of its divisors is an integer number (1961274).

Almost surely, 2^20813260 is an apocalyptic number.

20813260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20813260 is an abundant number, since it is smaller than the sum of its proper divisors (26257316).

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

20813260 is a wasteful number, since it uses less digits than its factorization.

20813260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80073 (or 80071 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20813260 is about 4562.1551924502. The cubic root of 20813260 is about 275.0722014275.

The spelling of 20813260 in words is "twenty million, eight hundred thirteen thousand, two hundred sixty".