20019520 has 56 divisors (see below), whose sum is σ = 48380904. Its totient is φ = 7888896.

The previous prime is 20019511. The next prime is 20019547. The reversal of 20019520 is 2591002.

It can be written as a sum of positive squares in 4 ways, for example, as 6594624 + 13424896 = 2568^2 + 3664^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22932 + ... + 23788.

Almost surely, 2^20019520 is an apocalyptic number.

20019520 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 20019520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24190452).

20019520 is an abundant number, since it is smaller than the sum of its proper divisors (28361384).

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

20019520 is an equidigital number, since it uses as much as digits as its factorization.

20019520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947 (or 937 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 20019520 is about 4474.3178250992. The cubic root of 20019520 is about 271.5300419983.

The spelling of 20019520 in words is "twenty million, nineteen thousand, five hundred twenty".