20645926 has 16 divisors (see below), whose sum is σ = 36350496. Its totient is φ = 8608896.

The previous prime is 20645921. The next prime is 20645957. The reversal of 20645926 is 62954602.

It is a junction number, because it is equal to n+sod(n) for n = 20645891 and 20645900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645921) 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, 19411 + ... + 20446.

It is an arithmetic number, because the mean of its divisors is an integer number (2271906).

Almost surely, 2^20645926 is an apocalyptic number.

20645926 is a deficient number, since it is larger than the sum of its proper divisors (15704570).

20645926 is a wasteful number, since it uses less digits than its factorization.

20645926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39903.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 20645926 is about 4543.7788238426. The cubic root of 20645926 is about 274.3330437971. Note that the first 3 decimals are identical.

The spelling of 20645926 in words is "twenty million, six hundred forty-five thousand, nine hundred twenty-six".