20410681 has 4 divisors (see below), whose sum is σ = 20885392. Its totient is φ = 19935972.

The previous prime is 20410667. The next prime is 20410703. The reversal of 20410681 is 18601402.

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 20410681 - 2⁷ = 20410553 is a prime.

It is a super-2 number, since 2×20410681² = 833191797767522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20410601) 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, 237291 + ... + 237376.

It is an arithmetic number, because the mean of its divisors is an integer number (5221348).

Almost surely, 2^20410681 is an apocalyptic number.

It is an amenable number.

20410681 is a deficient number, since it is larger than the sum of its proper divisors (474711).

20410681 is an equidigital number, since it uses as much as digits as its factorization.

20410681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474710.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 20410681 is about 4517.8181680984. The cubic root of 20410681 is about 273.2871207152.

The spelling of 20410681 in words is "twenty million, four hundred ten thousand, six hundred eighty-one".