20431222664 has 32 divisors (see below), whose sum is σ = 39273746400. Its totient is φ = 9958615680.

The previous prime is 20431222649. The next prime is 20431222681. The reversal of 20431222664 is 46622213402.

It is a happy number.

It is a super-3 number, since 3×20431222664³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20431222664.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404867 + ... + 452525.

It is an arithmetic number, because the mean of its divisors is an integer number (1227304575).

Almost surely, 2^20431222664 is an apocalyptic number.

It is an amenable number.

20431222664 is a deficient number, since it is larger than the sum of its proper divisors (18842523736).

20431222664 is a wasteful number, since it uses less digits than its factorization.

20431222664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49013 (or 49009 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The spelling of 20431222664 in words is "twenty billion, four hundred thirty-one million, two hundred twenty-two thousand, six hundred sixty-four".