20841890831 has 2 divisors, whose sum is σ = 20841890832. Its totient is φ = 20841890830.

The previous prime is 20841890827. The next prime is 20841890863. The reversal of 20841890831 is 13809814802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20841890831 - 2² = 20841890827 is a prime.

It is a super-2 number, since 2×20841890831² (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 (20841890821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420945415 + 10420945416.

It is an arithmetic number, because the mean of its divisors is an integer number (10420945416).

Almost surely, 2^20841890831 is an apocalyptic number.

20841890831 is a deficient number, since it is larger than the sum of its proper divisors (1).

20841890831 is an equidigital number, since it uses as much as digits as its factorization.

20841890831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 20841890831 in words is "twenty billion, eight hundred forty-one million, eight hundred ninety thousand, eight hundred thirty-one".