20613562651 has 4 divisors (see below), whose sum is σ = 22487522904. Its totient is φ = 18739602400.

The previous prime is 20613562643. The next prime is 20613562663. The reversal of 20613562651 is 15626531602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20613562651 - 2³ = 20613562643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20613562651.

It is not an unprimeable number, because it can be changed into a prime (20613532651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 936980110 + ... + 936980131.

It is an arithmetic number, because the mean of its divisors is an integer number (5621880726).

Almost surely, 2^20613562651 is an apocalyptic number.

20613562651 is a deficient number, since it is larger than the sum of its proper divisors (1873960253).

20613562651 is a wasteful number, since it uses less digits than its factorization.

20613562651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873960252.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 20613562651 in words is "twenty billion, six hundred thirteen million, five hundred sixty-two thousand, six hundred fifty-one".