20608661475 has 36 divisors (see below), whose sum is σ = 37203102976. Its totient is φ = 10904725440.

The previous prime is 20608661459. The next prime is 20608661477. The reversal of 20608661475 is 57416680602.

20608661475 is a `hidden beast` number, since 20 + 6 + 0 + 8 + 6 + 614 + 7 + 5 = 666.

It is not a de Polignac number, because 20608661475 - 2⁴ = 20608661459 is a prime.

It is a super-2 number, since 2×20608661475² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20608661475.

It is not an unprimeable number, because it can be changed into a prime (20608661477) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 332032 + ... + 389181.

Almost surely, 2^20608661475 is an apocalyptic number.

20608661475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20608661475 is a deficient number, since it is larger than the sum of its proper divisors (16594441501).

20608661475 is a wasteful number, since it uses less digits than its factorization.

20608661475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721356 (or 721348 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 20608661475 in words is "twenty billion, six hundred eight million, six hundred sixty-one thousand, four hundred seventy-five".