20557230 has 32 divisors (see below), whose sum is σ = 51040800. Its totient is φ = 5292672.

The previous prime is 20557223. The next prime is 20557241. The reversal of 20557230 is 3275502.

It is a self number, because there is not a number n which added to its sum of digits gives 20557230.

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, 10945 + ... + 12684.

It is an arithmetic number, because the mean of its divisors is an integer number (1595025).

Almost surely, 2^20557230 is an apocalyptic number.

20557230 is an abundant number, since it is smaller than the sum of its proper divisors (30483570).

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

20557230 is a wasteful number, since it uses less digits than its factorization.

20557230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23668.

The product of its (nonzero) digits is 2100, while the sum is 24.

The square root of 20557230 is about 4534.0081605573. The cubic root of 20557230 is about 273.9396300834.

The spelling of 20557230 in words is "twenty million, five hundred fifty-seven thousand, two hundred thirty".