20479742051 has 2 divisors, whose sum is σ = 20479742052. Its totient is φ = 20479742050.

The previous prime is 20479742011. The next prime is 20479742057. The reversal of 20479742051 is 15024797402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20479742051 - 2⁶ = 20479741987 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20479742057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10239871025 + 10239871026.

It is an arithmetic number, because the mean of its divisors is an integer number (10239871026).

Almost surely, 2^20479742051 is an apocalyptic number.

20479742051 is a deficient number, since it is larger than the sum of its proper divisors (1).

20479742051 is an equidigital number, since it uses as much as digits as its factorization.

20479742051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 20479742051 in words is "twenty billion, four hundred seventy-nine million, seven hundred forty-two thousand, fifty-one".