20613893505 has 32 divisors (see below), whose sum is σ = 33125113344. Its totient is φ = 10946555136.

The previous prime is 20613893491. The next prime is 20613893537. The reversal of 20613893505 is 50539831602.

It is not a de Polignac number, because 20613893505 - 2⁸ = 20613893249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3647592 + ... + 3653238.

It is an arithmetic number, because the mean of its divisors is an integer number (1035159792).

Almost surely, 2^20613893505 is an apocalyptic number.

It is an amenable number.

20613893505 is a deficient number, since it is larger than the sum of its proper divisors (12511219839).

20613893505 is a wasteful number, since it uses less digits than its factorization.

20613893505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6665.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 20613893505 in words is "twenty billion, six hundred thirteen million, eight hundred ninety-three thousand, five hundred five".