20379906676921 has 9 divisors (see below), whose sum is σ = 22401109029999. Its totient is φ = 18527142744000.

The previous prime is 20379906676903. The next prime is 20379906676973. The reversal of 20379906676921 is 12967660997302.

The square root of 20379906676921 is 4514411.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16417577563321 + 3962329113600 = 4051861^2 + 1990560^2 .

It is not a de Polignac number, because 20379906676921 - 2²⁵ = 20379873122489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20379906676621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 49453321 + ... + 49863721.

Almost surely, 2^{20379906676921} is an apocalyptic number.

20379906676921 is the 4514411-st square number.

20379906676921 is the 2257206-th centered octagonal number.

It is an amenable number.

20379906676921 is a deficient number, since it is larger than the sum of its proper divisors (2021202353078).

20379906676921 is an frugal number, since it uses more digits than its factorization.

20379906676921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820824 (or 410412 counting only the distinct ones).

The product of its (nonzero) digits is 92588832, while the sum is 67.

The spelling of 20379906676921 in words is "twenty trillion, three hundred seventy-nine billion, nine hundred six million, six hundred seventy-six thousand, nine hundred twenty-one".