20804620 has 48 divisors (see below), whose sum is σ = 46902240. Its totient is φ = 7727616.

The previous prime is 20804611. The next prime is 20804653. The reversal of 20804620 is 2640802.

It is a junction number, because it is equal to n+sod(n) for n = 20804591 and 20804600.

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, 19624 + ... + 20656.

It is an arithmetic number, because the mean of its divisors is an integer number (977130).

Almost surely, 2^20804620 is an apocalyptic number.

20804620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20804620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23451120).

20804620 is an abundant number, since it is smaller than the sum of its proper divisors (26097620).

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

20804620 is a wasteful number, since it uses less digits than its factorization.

20804620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20804620 is about 4561.2081732804. The cubic root of 20804620 is about 275.0341335042.

The spelling of 20804620 in words is "twenty million, eight hundred four thousand, six hundred twenty".