20415841 has 4 divisors (see below), whose sum is σ = 20890672. Its totient is φ = 19941012.

The previous prime is 20415821. The next prime is 20415847. The reversal of 20415841 is 14851402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20415841 - 2⁷ = 20415713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20415847) 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, 237351 + ... + 237436.

It is an arithmetic number, because the mean of its divisors is an integer number (5222668).

Almost surely, 2^20415841 is an apocalyptic number.

It is an amenable number.

20415841 is a deficient number, since it is larger than the sum of its proper divisors (474831).

20415841 is an equidigital number, since it uses as much as digits as its factorization.

20415841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474830.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 20415841 is about 4518.3892041302. The cubic root of 20415841 is about 273.3101485722.

The spelling of 20415841 in words is "twenty million, four hundred fifteen thousand, eight hundred forty-one".