20378876831 has 2 divisors, whose sum is σ = 20378876832. Its totient is φ = 20378876830.

The previous prime is 20378876827. The next prime is 20378876849. The reversal of 20378876831 is 13867887302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20378876831 - 2² = 20378876827 is a prime.

It is a super-2 number, since 2×20378876831² (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 (20378876821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10189438415 + 10189438416.

It is an arithmetic number, because the mean of its divisors is an integer number (10189438416).

Almost surely, 2^20378876831 is an apocalyptic number.

20378876831 is a deficient number, since it is larger than the sum of its proper divisors (1).

20378876831 is an equidigital number, since it uses as much as digits as its factorization.

20378876831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 20378876831 in words is "twenty billion, three hundred seventy-eight million, eight hundred seventy-six thousand, eight hundred thirty-one".