20449330457 has 2 divisors, whose sum is σ = 20449330458. Its totient is φ = 20449330456.

The previous prime is 20449330427. The next prime is 20449330463. The reversal of 20449330457 is 75403394402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20290293136 + 159037321 = 142444^2 + 12611^2 .

It is a cyclic number.

It is not a de Polignac number, because 20449330457 - 2¹² = 20449326361 is a prime.

It is a super-2 number, since 2×20449330457² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20449330427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10224665228 + 10224665229.

It is an arithmetic number, because the mean of its divisors is an integer number (10224665229).

Almost surely, 2^20449330457 is an apocalyptic number.

It is an amenable number.

20449330457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20449330457 is an equidigital number, since it uses as much as digits as its factorization.

20449330457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 41.

The spelling of 20449330457 in words is "twenty billion, four hundred forty-nine million, three hundred thirty thousand, four hundred fifty-seven".