20356370505 has 24 divisors (see below), whose sum is σ = 35304572160. Its totient is φ = 10850516640.

The previous prime is 20356370491. The next prime is 20356370521. The reversal of 20356370505 is 50507365302.

20356370505 is a `hidden beast` number, since 20 + 3 + 5 + 63 + 70 + 505 = 666.

It is not a de Polignac number, because 20356370505 - 2¹⁵ = 20356337737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20356370505.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49431 + ... + 207740.

It is an arithmetic number, because the mean of its divisors is an integer number (1471023840).

Almost surely, 2^20356370505 is an apocalyptic number.

It is an amenable number.

20356370505 is a deficient number, since it is larger than the sum of its proper divisors (14948201655).

20356370505 is a wasteful number, since it uses less digits than its factorization.

20356370505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258941 (or 258938 counting only the distinct ones).

The product of its (nonzero) digits is 94500, while the sum is 36.

The spelling of 20356370505 in words is "twenty billion, three hundred fifty-six million, three hundred seventy thousand, five hundred five".