20533245449 has 2 divisors, whose sum is σ = 20533245450. Its totient is φ = 20533245448.

The previous prime is 20533245437. The next prime is 20533245457. The reversal of 20533245449 is 94454233502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16086356224 + 4446889225 = 126832^2 + 66685^2 .

It is a cyclic number.

It is not a de Polignac number, because 20533245449 - 2⁴ = 20533245433 is a prime.

It is a super-2 number, since 2×20533245449² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20533245409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10266622724 + 10266622725.

It is an arithmetic number, because the mean of its divisors is an integer number (10266622725).

Almost surely, 2^20533245449 is an apocalyptic number.

It is an amenable number.

20533245449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20533245449 is an equidigital number, since it uses as much as digits as its factorization.

20533245449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 41.

The spelling of 20533245449 in words is "twenty billion, five hundred thirty-three million, two hundred forty-five thousand, four hundred forty-nine".