20900641 has 4 divisors (see below), whose sum is σ = 21092500. Its totient is φ = 20708784.

The previous prime is 20900609. The next prime is 20900653. The reversal of 20900641 is 14600902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14600902 = 2 ⋅7300451.

It can be written as a sum of positive squares in 2 ways, for example, as 6270016 + 14630625 = 2504^2 + 3825^2 .

It is a cyclic number.

It is not a de Polignac number, because 20900641 - 2⁵ = 20900609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20900441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95766 + ... + 95983.

It is an arithmetic number, because the mean of its divisors is an integer number (5273125).

Almost surely, 2^20900641 is an apocalyptic number.

It is an amenable number.

20900641 is a deficient number, since it is larger than the sum of its proper divisors (191859).

20900641 is a wasteful number, since it uses less digits than its factorization.

20900641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191858.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20900641 is about 4571.7218856794. The cubic root of 20900641 is about 275.4566122167.

The spelling of 20900641 in words is "twenty million, nine hundred thousand, six hundred forty-one".