20823630 has 32 divisors (see below), whose sum is σ = 51591168. Its totient is φ = 5373600.

The previous prime is 20823619. The next prime is 20823643. The reversal of 20823630 is 3632802.

It is a self number, because there is not a number n which added to its sum of digits gives 20823630.

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, 10266 + ... + 12125.

It is an arithmetic number, because the mean of its divisors is an integer number (1612224).

Almost surely, 2^20823630 is an apocalyptic number.

20823630 is an abundant number, since it is smaller than the sum of its proper divisors (30767538).

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

20823630 is a wasteful number, since it uses less digits than its factorization.

20823630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22432.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20823630 is about 4563.2915751681. The cubic root of 20823630 is about 275.1178778395.

The spelling of 20823630 in words is "twenty million, eight hundred twenty-three thousand, six hundred thirty".