20720250751 has 2 divisors, whose sum is σ = 20720250752. Its totient is φ = 20720250750.

The previous prime is 20720250703. The next prime is 20720250757. The reversal of 20720250751 is 15705202702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20720250751 - 2⁷ = 20720250623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20720250757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10360125375 + 10360125376.

It is an arithmetic number, because the mean of its divisors is an integer number (10360125376).

Almost surely, 2^20720250751 is an apocalyptic number.

20720250751 is a deficient number, since it is larger than the sum of its proper divisors (1).

20720250751 is an equidigital number, since it uses as much as digits as its factorization.

20720250751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9800, while the sum is 31.

The spelling of 20720250751 in words is "twenty billion, seven hundred twenty million, two hundred fifty thousand, seven hundred fifty-one".