20157216 has 24 divisors (see below), whose sum is σ = 52912944. Its totient is φ = 6719040.

The previous prime is 20157211. The next prime is 20157229. The reversal of 20157216 is 61275102.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 in 3 ways as a sum of consecutive naturals, for example, 104890 + ... + 105081.

It is an arithmetic number, because the mean of its divisors is an integer number (2204706).

Almost surely, 2^20157216 is an apocalyptic number.

It is an amenable number.

20157216 is an abundant number, since it is smaller than the sum of its proper divisors (32755728).

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

20157216 is a wasteful number, since it uses less digits than its factorization.

20157216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209984 (or 209976 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 20157216 is about 4489.6788303842. The cubic root of 20157216 is about 272.1511558918.

The spelling of 20157216 in words is "twenty million, one hundred fifty-seven thousand, two hundred sixteen".