20157894431 has 2 divisors, whose sum is σ = 20157894432. Its totient is φ = 20157894430.

The previous prime is 20157894331. The next prime is 20157894451. The reversal of 20157894431 is 13449875102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20157894431 - 2¹⁰ = 20157893407 is a prime.

It is a super-2 number, since 2×20157894431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20157894451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10078947215 + 10078947216.

It is an arithmetic number, because the mean of its divisors is an integer number (10078947216).

Almost surely, 2^20157894431 is an apocalyptic number.

20157894431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20157894431 is an equidigital number, since it uses as much as digits as its factorization.

20157894431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 20157894431 in words is "twenty billion, one hundred fifty-seven million, eight hundred ninety-four thousand, four hundred thirty-one".