20157212 has 6 divisors (see below), whose sum is σ = 35275128. Its totient is φ = 10078604.

The previous prime is 20157211. The next prime is 20157229. The reversal of 20157212 is 21275102.

It is a super-2 number, since 2×20157212² = 812626391225888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20157211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2519648 + ... + 2519655.

It is an arithmetic number, because the mean of its divisors is an integer number (5879188).

Almost surely, 2^20157212 is an apocalyptic number.

It is an amenable number.

20157212 is a deficient number, since it is larger than the sum of its proper divisors (15117916).

20157212 is a wasteful number, since it uses less digits than its factorization.

20157212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5039307 (or 5039305 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 20157212 is about 4489.6783849180. The cubic root of 20157212 is about 272.1511378899.

The spelling of 20157212 in words is "twenty million, one hundred fifty-seven thousand, two hundred twelve".