20717712 has 30 divisors (see below), whose sum is σ = 57981222. Its totient is φ = 6905856.

The previous prime is 20717707. The next prime is 20717717. The reversal of 20717712 is 21771702.

It is an interprime number because it is at equal distance from previous prime (20717707) and next prime (20717717).

It can be written as a sum of positive squares in only one way, i.e., 11861136 + 8856576 = 3444^2 + 2976^2 .

It is not an unprimeable number, because it can be changed into a prime (20717717) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71793 + ... + 72080.

Almost surely, 2^20717712 is an apocalyptic number.

It is an amenable number.

20717712 is an abundant number, since it is smaller than the sum of its proper divisors (37263510).

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

20717712 is a wasteful number, since it uses less digits than its factorization.

20717712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143887 (or 143878 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 27.

The square root of 20717712 is about 4551.6713413866. The cubic root of 20717712 is about 274.6506285081.

The spelling of 20717712 in words is "twenty million, seven hundred seventeen thousand, seven hundred twelve".