20236645 has 48 divisors (see below), whose sum is σ = 30030336. Its totient is φ = 12988800.

The previous prime is 20236639. The next prime is 20236651. The reversal of 20236645 is 54663202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20236639) and next prime (20236651).

It is not a de Polignac number, because 20236645 - 2³ = 20236637 is a prime.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 243774 + ... + 243856.

It is an arithmetic number, because the mean of its divisors is an integer number (625632).

Almost surely, 2^20236645 is an apocalyptic number.

It is an amenable number.

20236645 is a deficient number, since it is larger than the sum of its proper divisors (9793691).

20236645 is a wasteful number, since it uses less digits than its factorization.

20236645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20236645 is about 4498.5158663719. The cubic root of 20236645 is about 272.5081556350.

Adding to 20236645 its reverse (54663202), we get a palindrome (74899847).

It can be divided in two parts, 2023 and 6645, that added together give a palindrome (8668).

The spelling of 20236645 in words is "twenty million, two hundred thirty-six thousand, six hundred forty-five".