20632879381 has 2 divisors, whose sum is σ = 20632879382. Its totient is φ = 20632879380.

The previous prime is 20632879357. The next prime is 20632879417. The reversal of 20632879381 is 18397823602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11884270225 + 8748609156 = 109015^2 + 93534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20632879381 is a prime.

It is a super-2 number, since 2×20632879381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20632879301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10316439690 + 10316439691.

It is an arithmetic number, because the mean of its divisors is an integer number (10316439691).

Almost surely, 2^20632879381 is an apocalyptic number.

It is an amenable number.

20632879381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20632879381 is an equidigital number, since it uses as much as digits as its factorization.

20632879381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 20632879381 in words is "twenty billion, six hundred thirty-two million, eight hundred seventy-nine thousand, three hundred eighty-one".