20146993931 has 2 divisors, whose sum is σ = 20146993932. Its totient is φ = 20146993930.

The previous prime is 20146993903. The next prime is 20146993943. The reversal of 20146993931 is 13939964102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20146993931 - 2³⁴ = 2967124747 is a prime.

It is a super-2 number, since 2×20146993931² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20146993631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10073496965 + 10073496966.

It is an arithmetic number, because the mean of its divisors is an integer number (10073496966).

Almost surely, 2^20146993931 is an apocalyptic number.

20146993931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20146993931 is an equidigital number, since it uses as much as digits as its factorization.

20146993931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 47.

The spelling of 20146993931 in words is "twenty billion, one hundred forty-six million, nine hundred ninety-three thousand, nine hundred thirty-one".