20417993564 has 6 divisors (see below), whose sum is σ = 35731488744. Its totient is φ = 10208996780.

The previous prime is 20417993539. The next prime is 20417993569. The reversal of 20417993564 is 46539971402.

It is a super-2 number, since 2×20417993564² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20417993569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2552249192 + ... + 2552249199.

It is an arithmetic number, because the mean of its divisors is an integer number (5955248124).

Almost surely, 2^20417993564 is an apocalyptic number.

It is an amenable number.

20417993564 is a deficient number, since it is larger than the sum of its proper divisors (15313495180).

20417993564 is a wasteful number, since it uses less digits than its factorization.

20417993564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5104498395 (or 5104498393 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 20417993564 in words is "twenty billion, four hundred seventeen million, nine hundred ninety-three thousand, five hundred sixty-four".