20164730621 has 8 divisors (see below), whose sum is σ = 23065936704. Its totient is φ = 17268657120.

The previous prime is 20164730581. The next prime is 20164730629. The reversal of 20164730621 is 12603746102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20164730621 - 2²⁶ = 20097621757 is a prime.

It is a super-2 number, since 2×20164730621² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20164730629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1274720 + ... + 1290441.

It is an arithmetic number, because the mean of its divisors is an integer number (2883242088).

Almost surely, 2^20164730621 is an apocalyptic number.

It is an amenable number.

20164730621 is a deficient number, since it is larger than the sum of its proper divisors (2901206083).

20164730621 is a wasteful number, since it uses less digits than its factorization.

20164730621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566291.

The product of its (nonzero) digits is 12096, while the sum is 32.

The spelling of 20164730621 in words is "twenty billion, one hundred sixty-four million, seven hundred thirty thousand, six hundred twenty-one".