20857232 has 40 divisors (see below), whose sum is σ = 46684512. Its totient is φ = 8921600.

The previous prime is 20857217. The next prime is 20857247. The reversal of 20857232 is 23275802.

It is an interprime number because it is at equal distance from previous prime (20857217) and next prime (20857247).

It is a junction number, because it is equal to n+sod(n) for n = 20857195 and 20857204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 494 + ... + 6477.

Almost surely, 2^20857232 is an apocalyptic number.

20857232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20857232 is an abundant number, since it is smaller than the sum of its proper divisors (25827280).

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

20857232 is a wasteful number, since it uses less digits than its factorization.

20857232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007 (or 7001 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20857232 is about 4566.9718632810. The cubic root of 20857232 is about 275.2657794129.

The spelling of 20857232 in words is "twenty million, eight hundred fifty-seven thousand, two hundred thirty-two".