20862928081 has 2 divisors, whose sum is σ = 20862928082. Its totient is φ = 20862928080.

The previous prime is 20862928033. The next prime is 20862928117. The reversal of 20862928081 is 18082926802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20827107856 + 35820225 = 144316^2 + 5985^2 .

It is a cyclic number.

It is not a de Polignac number, because 20862928081 - 2²³ = 20854539473 is a prime.

It is a super-2 number, since 2×20862928081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20862928181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10431464040 + 10431464041.

It is an arithmetic number, because the mean of its divisors is an integer number (10431464041).

Almost surely, 2^20862928081 is an apocalyptic number.

It is an amenable number.

20862928081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20862928081 is an equidigital number, since it uses as much as digits as its factorization.

20862928081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 46.

The spelling of 20862928081 in words is "twenty billion, eight hundred sixty-two million, nine hundred twenty-eight thousand, eighty-one".