20011291831 has 2 divisors, whose sum is σ = 20011291832. Its totient is φ = 20011291830.

The previous prime is 20011291823. The next prime is 20011291873. The reversal of 20011291831 is 13819211002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20011291831 - 2³ = 20011291823 is a prime.

It is a super-2 number, since 2×20011291831² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20011291831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011291801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005645915 + 10005645916.

It is an arithmetic number, because the mean of its divisors is an integer number (10005645916).

Almost surely, 2^20011291831 is an apocalyptic number.

20011291831 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011291831 is an equidigital number, since it uses as much as digits as its factorization.

20011291831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The spelling of 20011291831 in words is "twenty billion, eleven million, two hundred ninety-one thousand, eight hundred thirty-one".