20252861 has 2 divisors, whose sum is σ = 20252862. Its totient is φ = 20252860.

The previous prime is 20252851. The next prime is 20252863. The reversal of 20252861 is 16825202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19971961 + 280900 = 4469^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 20252861 - 2¹⁰ = 20251837 is a prime.

It is a Sophie Germain prime.

Together with 20252863, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20252861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20252863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10126430 + 10126431.

It is an arithmetic number, because the mean of its divisors is an integer number (10126431).

Almost surely, 2^20252861 is an apocalyptic number.

It is an amenable number.

20252861 is a deficient number, since it is larger than the sum of its proper divisors (1).

20252861 is an equidigital number, since it uses as much as digits as its factorization.

20252861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20252861 is about 4500.3178776615. The cubic root of 20252861 is about 272.5809248191.

The spelling of 20252861 in words is "twenty million, two hundred fifty-two thousand, eight hundred sixty-one".