20087513217 has 16 divisors (see below), whose sum is σ = 29761462080. Its totient is φ = 13390693056.

The previous prime is 20087513209. The next prime is 20087513311. The reversal of 20087513217 is 71231578002.

20087513217 is a `hidden beast` number, since 200 + 87 + 51 + 321 + 7 = 666.

It is not a de Polignac number, because 20087513217 - 2³ = 20087513209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20087513717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 699178 + ... + 727340.

It is an arithmetic number, because the mean of its divisors is an integer number (1860091380).

Almost surely, 2^20087513217 is an apocalyptic number.

20087513217 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20087513217 is a deficient number, since it is larger than the sum of its proper divisors (9673948863).

20087513217 is a wasteful number, since it uses less digits than its factorization.

20087513217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54589 (or 54583 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The spelling of 20087513217 in words is "twenty billion, eighty-seven million, five hundred thirteen thousand, two hundred seventeen".