20831469291 has 12 divisors (see below), whose sum is σ = 30101233968. Its totient is φ = 13882415184.

The previous prime is 20831469251. The next prime is 20831469301. The reversal of 20831469291 is 19296413802.

20831469291 is a `hidden beast` number, since 20 + 83 + 1 + 469 + 2 + 91 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-20831469291 is a prime.

It is a super-2 number, since 2×20831469291² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20831469251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 410620 + ... + 458553.

It is an arithmetic number, because the mean of its divisors is an integer number (2508436164).

Almost surely, 2^20831469291 is an apocalyptic number.

20831469291 is a deficient number, since it is larger than the sum of its proper divisors (9269764677).

20831469291 is a wasteful number, since it uses less digits than its factorization.

20831469291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871842 (or 871839 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 20831469291 in words is "twenty billion, eight hundred thirty-one million, four hundred sixty-nine thousand, two hundred ninety-one".