20744991451 has 2 divisors, whose sum is σ = 20744991452. Its totient is φ = 20744991450.

The previous prime is 20744991313. The next prime is 20744991461. The reversal of 20744991451 is 15419944702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20744991451 - 2¹⁷ = 20744860379 is a prime.

It is not a weakly prime, because it can be changed into another prime (20744991461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10372495725 + 10372495726.

It is an arithmetic number, because the mean of its divisors is an integer number (10372495726).

Almost surely, 2^20744991451 is an apocalyptic number.

20744991451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20744991451 is an equidigital number, since it uses as much as digits as its factorization.

20744991451 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 46.

The spelling of 20744991451 in words is "twenty billion, seven hundred forty-four million, nine hundred ninety-one thousand, four hundred fifty-one".