20646626 has 32 divisors (see below), whose sum is σ = 41586048. Its totient is φ = 7424640.

The previous prime is 20646611. The next prime is 20646631. The reversal of 20646626 is 62664602.

It is a junction number, because it is equal to n+sod(n) for n = 20646592 and 20646601.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3155 + ... + 7158.

It is an arithmetic number, because the mean of its divisors is an integer number (1299564).

Almost surely, 2^20646626 is an apocalyptic number.

20646626 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20646626 is an abundant number, since it is smaller than the sum of its proper divisors (20939422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20646626 is a wasteful number, since it uses less digits than its factorization.

20646626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10346.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 20646626 is about 4543.8558515868. The cubic root of 20646626 is about 274.3361441821.

It can be divided in two parts, 20 and 646626, that added together give a palindrome (646646).

The spelling of 20646626 in words is "twenty million, six hundred forty-six thousand, six hundred twenty-six".