9920087931 has 16 divisors (see below), whose sum is σ = 14261838080. Its totient is φ = 6097122720.

The previous prime is 9920087923. The next prime is 9920087939. The reversal of 9920087931 is 1397800299.

It is an interprime number because it is at equal distance from previous prime (9920087923) and next prime (9920087939).

It is not a de Polignac number, because 9920087931 - 2³ = 9920087923 is a prime.

It is a super-2 number, since 2×9920087931² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9920087939) 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, 125191 + ... + 188448.

It is an arithmetic number, because the mean of its divisors is an integer number (891364880).

Almost surely, 2^9920087931 is an apocalyptic number.

9920087931 is a deficient number, since it is larger than the sum of its proper divisors (4341750149).

9920087931 is a wasteful number, since it uses less digits than its factorization.

9920087931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314466.

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 9920087931 is about 99599.6382071742. The cubic root of 9920087931 is about 2148.6804905837.

The spelling of 9920087931 in words is "nine billion, nine hundred twenty million, eighty-seven thousand, nine hundred thirty-one".