20657630 has 32 divisors (see below), whose sum is σ = 43490304. Its totient is φ = 6916896.

The previous prime is 20657627. The next prime is 20657653. The reversal of 20657630 is 3675602.

It is a junction number, because it is equal to n+sod(n) for n = 20657593 and 20657602.

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, 422 + ... + 6441.

It is an arithmetic number, because the mean of its divisors is an integer number (1359072).

Almost surely, 2^20657630 is an apocalyptic number.

20657630 is an abundant number, since it is smaller than the sum of its proper divisors (22832674).

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

20657630 is a wasteful number, since it uses less digits than its factorization.

20657630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6920.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 20657630 is about 4545.0665561683. The cubic root of 20657630 is about 274.3848730282.

The spelling of 20657630 in words is "twenty million, six hundred fifty-seven thousand, six hundred thirty".