20608278356 has 24 divisors (see below), whose sum is σ = 38209602816. Its totient is φ = 9692000640.

The previous prime is 20608278347. The next prime is 20608278367. The reversal of 20608278356 is 65387280602.

It is a happy number.

It is a super-2 number, since 2×20608278356² (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 20608278356.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17501 + ... + 203771.

It is an arithmetic number, because the mean of its divisors is an integer number (1592066784).

Almost surely, 2^20608278356 is an apocalyptic number.

It is an amenable number.

20608278356 is a deficient number, since it is larger than the sum of its proper divisors (17601324460).

20608278356 is a wasteful number, since it uses less digits than its factorization.

20608278356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187919 (or 187917 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 20608278356 in words is "twenty billion, six hundred eight million, two hundred seventy-eight thousand, three hundred fifty-six".