20748751 has 2 divisors, whose sum is σ = 20748752. Its totient is φ = 20748750.

The previous prime is 20748727. The next prime is 20748757. The reversal of 20748751 is 15784702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20748751 - 2⁵ = 20748719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20748757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10374375 + 10374376.

It is an arithmetic number, because the mean of its divisors is an integer number (10374376).

Almost surely, 2^20748751 is an apocalyptic number.

20748751 is a deficient number, since it is larger than the sum of its proper divisors (1).

20748751 is an equidigital number, since it uses as much as digits as its factorization.

20748751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 20748751 is about 4555.0796919483. The cubic root of 20748751 is about 274.7877193721.

The spelling of 20748751 in words is "twenty million, seven hundred forty-eight thousand, seven hundred fifty-one".