20426645 has 8 divisors (see below), whose sum is σ = 25577856. Its totient is φ = 15630736.

The previous prime is 20426633. The next prime is 20426647. The reversal of 20426645 is 54662402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20426645 - 2⁸ = 20426389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20426647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88697 + ... + 88926.

It is an arithmetic number, because the mean of its divisors is an integer number (3197232).

Almost surely, 2^20426645 is an apocalyptic number.

It is an amenable number.

20426645 is a deficient number, since it is larger than the sum of its proper divisors (5151211).

20426645 is a wasteful number, since it uses less digits than its factorization.

20426645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177651.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 20426645 is about 4519.5846048061. The cubic root of 20426645 is about 273.3583516990.

The spelling of 20426645 in words is "twenty million, four hundred twenty-six thousand, six hundred forty-five".