20277586481 has 2 divisors, whose sum is σ = 20277586482. Its totient is φ = 20277586480.

The previous prime is 20277586457. The next prime is 20277586489. The reversal of 20277586481 is 18468577202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19415635600 + 861950881 = 139340^2 + 29359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20277586481 is a prime.

It is a super-2 number, since 2×20277586481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20277586489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10138793240 + 10138793241.

It is an arithmetic number, because the mean of its divisors is an integer number (10138793241).

Almost surely, 2^20277586481 is an apocalyptic number.

It is an amenable number.

20277586481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20277586481 is an equidigital number, since it uses as much as digits as its factorization.

20277586481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1505280, while the sum is 50.

The spelling of 20277586481 in words is "twenty billion, two hundred seventy-seven million, five hundred eighty-six thousand, four hundred eighty-one".