20500901 has 2 divisors, whose sum is σ = 20500902. Its totient is φ = 20500900.

The previous prime is 20500897. The next prime is 20500939. The reversal of 20500901 is 10900502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 160801 = 4510^2 + 401^2 .

It is a cyclic number.

It is not a de Polignac number, because 20500901 - 2² = 20500897 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20500901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20520901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250450 + 10250451.

It is an arithmetic number, because the mean of its divisors is an integer number (10250451).

Almost surely, 2^20500901 is an apocalyptic number.

It is an amenable number.

20500901 is a deficient number, since it is larger than the sum of its proper divisors (1).

20500901 is an equidigital number, since it uses as much as digits as its factorization.

20500901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 20500901 is about 4527.7920667805. The cubic root of 20500901 is about 273.6891932804.

The spelling of 20500901 in words is "twenty million, five hundred thousand, nine hundred one".