20401320431 has 2 divisors, whose sum is σ = 20401320432. Its totient is φ = 20401320430.

The previous prime is 20401320419. The next prime is 20401320451. The reversal of 20401320431 is 13402310402.

It is an a-pointer prime, because the next prime (20401320451) can be obtained adding 20401320431 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20401320431 - 2²⁶ = 20334211567 is a prime.

It is a super-2 number, since 2×20401320431² (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 (20401320451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200660215 + 10200660216.

It is an arithmetic number, because the mean of its divisors is an integer number (10200660216).

Almost surely, 2^20401320431 is an apocalyptic number.

20401320431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401320431 is an equidigital number, since it uses as much as digits as its factorization.

20401320431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20401320431 its reverse (13402310402), we get a palindrome (33803630833).

The spelling of 20401320431 in words is "twenty billion, four hundred one million, three hundred twenty thousand, four hundred thirty-one".