20591220 has 48 divisors (see below), whose sum is σ = 62092800. Its totient is φ = 5068416.

The previous prime is 20591213. The next prime is 20591239. The reversal of 20591220 is 2219502.

It is a congruent number.

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, 12420 + ... + 13979.

It is an arithmetic number, because the mean of its divisors is an integer number (1293600).

Almost surely, 2^20591220 is an apocalyptic number.

20591220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20591220 is an abundant number, since it is smaller than the sum of its proper divisors (41501580).

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

20591220 is a wasteful number, since it uses less digits than its factorization.

20591220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26424 (or 26422 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20591220 is about 4537.7549515151. The cubic root of 20591220 is about 274.0905272116.

The spelling of 20591220 in words is "twenty million, five hundred ninety-one thousand, two hundred twenty".