20356504651 has 32 divisors (see below), whose sum is σ = 23971501440. Its totient is φ = 16927488000.

The previous prime is 20356504631. The next prime is 20356504657. The reversal of 20356504651 is 15640565302.

It is a cyclic number.

It is not a de Polignac number, because 20356504651 - 2¹⁹ = 20355980363 is a prime.

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 20356504651.

It is not an unprimeable number, because it can be changed into a prime (20356504657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13670515 + ... + 13672003.

It is an arithmetic number, because the mean of its divisors is an integer number (749109420).

Almost surely, 2^20356504651 is an apocalyptic number.

20356504651 is a deficient number, since it is larger than the sum of its proper divisors (3614996789).

20356504651 is a wasteful number, since it uses less digits than its factorization.

20356504651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 20356504651 in words is "twenty billion, three hundred fifty-six million, five hundred four thousand, six hundred fifty-one".