20382163944921 has 45 divisors (see below), whose sum is σ = 30912780881829. Its totient is φ = 13383513889416.

The previous prime is 20382163944889. The next prime is 20382163944931. The reversal of 20382163944921 is 12944936128302.

It is a happy number.

The square root of 20382163944921 is 4514661.

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

20382163944921 is a `hidden beast` number, since 2 + 0 + 3 + 8 + 2 + 1 + 63 + 94 + 492 + 1 = 666.

It is not a de Polignac number, because 20382163944921 - 2⁵ = 20382163944889 is a prime.

It is a super-2 number, since 2×20382163944921² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20382163944931) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 2722336840 + ... + 2722344326.

Almost surely, 2^{20382163944921} is an apocalyptic number.

20382163944921 is the 4514661-st square number.

20382163944921 is the 2257331-st centered octagonal number.

It is an amenable number.

20382163944921 is a deficient number, since it is larger than the sum of its proper divisors (10530616936908).

20382163944921 is an frugal number, since it uses more digits than its factorization.

20382163944921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15120 (or 7557 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The spelling of 20382163944921 in words is "twenty trillion, three hundred eighty-two billion, one hundred sixty-three million, nine hundred forty-four thousand, nine hundred twenty-one".