20657130 has 32 divisors (see below), whose sum is σ = 53391744. Its totient is φ = 5084736.

The previous prime is 20657107. The next prime is 20657141. The reversal of 20657130 is 3175602.

It is a self number, because there is not a number n which added to its sum of digits gives 20657130.

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, 26094 + ... + 26873.

It is an arithmetic number, because the mean of its divisors is an integer number (1668492).

Almost surely, 2^20657130 is an apocalyptic number.

20657130 is an abundant number, since it is smaller than the sum of its proper divisors (32734614).

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

20657130 is a wasteful number, since it uses less digits than its factorization.

20657130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52990.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 20657130 is about 4545.0115511404. The cubic root of 20657130 is about 274.3826592611.

The spelling of 20657130 in words is "twenty million, six hundred fifty-seven thousand, one hundred thirty".