20525501 has 2 divisors, whose sum is σ = 20525502. Its totient is φ = 20525500.

The previous prime is 20525497. The next prime is 20525521. The reversal of 20525501 is 10552502.

It is an a-pointer prime, because the next prime (20525521) can be obtained adding 20525501 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19624900 + 900601 = 4430^2 + 949^2 .

It is a cyclic number.

It is not a de Polignac number, because 20525501 - 2² = 20525497 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20525521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10262750 + 10262751.

It is an arithmetic number, because the mean of its divisors is an integer number (10262751).

Almost surely, 2^20525501 is an apocalyptic number.

It is an amenable number.

20525501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20525501 is an equidigital number, since it uses as much as digits as its factorization.

20525501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 20525501 is about 4530.5078081822. The cubic root of 20525501 is about 273.7986203891.

The spelling of 20525501 in words is "twenty million, five hundred twenty-five thousand, five hundred one".