20520704 has 36 divisors (see below), whose sum is σ = 41574960. Its totient is φ = 10106880.

The previous prime is 20520701. The next prime is 20520743. The reversal of 20520704 is 40702502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17612 + ... + 18740.

It is an arithmetic number, because the mean of its divisors is an integer number (1154860).

Almost surely, 2^20520704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20520704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20787480).

20520704 is an abundant number, since it is smaller than the sum of its proper divisors (21054256).

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

20520704 is an equidigital number, since it uses as much as digits as its factorization.

20520704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216 (or 1202 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 20520704 is about 4529.9783663943. The cubic root of 20520704 is about 273.7772889680. Note that the first 3 decimals are identical.

The spelling of 20520704 in words is "twenty million, five hundred twenty thousand, seven hundred four".