20725769 has 2 divisors, whose sum is σ = 20725770. Its totient is φ = 20725768.

The previous prime is 20725753. The next prime is 20725799. The reversal of 20725769 is 96752702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19035769 + 1690000 = 4363^2 + 1300^2 .

It is a cyclic number.

It is not a de Polignac number, because 20725769 - 2⁴ = 20725753 is a prime.

It is a super-2 number, since 2×20725769² = 859115001282722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20725709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10362884 + 10362885.

It is an arithmetic number, because the mean of its divisors is an integer number (10362885).

Almost surely, 2^20725769 is an apocalyptic number.

It is an amenable number.

20725769 is a deficient number, since it is larger than the sum of its proper divisors (1).

20725769 is an equidigital number, since it uses as much as digits as its factorization.

20725769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 20725769 is about 4552.5563148631. The cubic root of 20725769 is about 274.6862272480.

The spelling of 20725769 in words is "twenty million, seven hundred twenty-five thousand, seven hundred sixty-nine".