20725361 has 2 divisors, whose sum is σ = 20725362. Its totient is φ = 20725360.

The previous prime is 20725339. The next prime is 20725373. The reversal of 20725361 is 16352702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20295025 + 430336 = 4505^2 + 656^2 .

It is a cyclic number.

It is not a de Polignac number, because 20725361 - 2⁶ = 20725297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20725361.

It is not a weakly prime, because it can be changed into another prime (20725961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10362680 + 10362681.

It is an arithmetic number, because the mean of its divisors is an integer number (10362681).

Almost surely, 2^20725361 is an apocalyptic number.

It is an amenable number.

20725361 is a deficient number, since it is larger than the sum of its proper divisors (1).

20725361 is an equidigital number, since it uses as much as digits as its factorization.

20725361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20725361 is about 4552.5115046532. The cubic root of 20725361 is about 274.6844247782.

The spelling of 20725361 in words is "twenty million, seven hundred twenty-five thousand, three hundred sixty-one".