20616930431 has 2 divisors, whose sum is σ = 20616930432. Its totient is φ = 20616930430.

The previous prime is 20616930409. The next prime is 20616930443. The reversal of 20616930431 is 13403961602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20616930431 - 2¹⁴ = 20616914047 is a prime.

It is a super-2 number, since 2×20616930431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20616930391 and 20616930400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20616930461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308465215 + 10308465216.

It is an arithmetic number, because the mean of its divisors is an integer number (10308465216).

Almost surely, 2^20616930431 is an apocalyptic number.

20616930431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20616930431 is an equidigital number, since it uses as much as digits as its factorization.

20616930431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The spelling of 20616930431 in words is "twenty billion, six hundred sixteen million, nine hundred thirty thousand, four hundred thirty-one".