20900357 has 4 divisors (see below), whose sum is σ = 20946156. Its totient is φ = 20854560.

The previous prime is 20900339. The next prime is 20900371. The reversal of 20900357 is 75300902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10666756 + 10233601 = 3266^2 + 3199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20900357 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20900317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22208 + ... + 23129.

It is an arithmetic number, because the mean of its divisors is an integer number (5236539).

Almost surely, 2^20900357 is an apocalyptic number.

It is an amenable number.

20900357 is a deficient number, since it is larger than the sum of its proper divisors (45799).

20900357 is an equidigital number, since it uses as much as digits as its factorization.

20900357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45798.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 20900357 is about 4571.6908250668. The cubic root of 20900357 is about 275.4553645670.

The spelling of 20900357 in words is "twenty million, nine hundred thousand, three hundred fifty-seven".