20432502281 has 2 divisors, whose sum is σ = 20432502282. Its totient is φ = 20432502280.

The previous prime is 20432502269. The next prime is 20432502289. The reversal of 20432502281 is 18220523402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19911749881 + 520752400 = 141109^2 + 22820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20432502281 is a prime.

It is a super-2 number, since 2×20432502281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20432502289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10216251140 + 10216251141.

It is an arithmetic number, because the mean of its divisors is an integer number (10216251141).

Almost surely, 2^20432502281 is an apocalyptic number.

It is an amenable number.

20432502281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20432502281 is an equidigital number, since it uses as much as digits as its factorization.

20432502281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 29.

The spelling of 20432502281 in words is "twenty billion, four hundred thirty-two million, five hundred two thousand, two hundred eighty-one".