20451722293 has 2 divisors, whose sum is σ = 20451722294. Its totient is φ = 20451722292.

The previous prime is 20451722261. The next prime is 20451722323. The reversal of 20451722293 is 39222715402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12495439089 + 7956283204 = 111783^2 + 89198^2 .

It is a cyclic number.

It is not a de Polignac number, because 20451722293 - 2⁵ = 20451722261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20451722243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225861146 + 10225861147.

It is an arithmetic number, because the mean of its divisors is an integer number (10225861147).

Almost surely, 2^20451722293 is an apocalyptic number.

It is an amenable number.

20451722293 is a deficient number, since it is larger than the sum of its proper divisors (1).

20451722293 is an equidigital number, since it uses as much as digits as its factorization.

20451722293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 20451722293 in words is "twenty billion, four hundred fifty-one million, seven hundred twenty-two thousand, two hundred ninety-three".