20072520 has 96 divisors (see below), whose sum is σ = 70270200. Its totient is φ = 4939776.

The previous prime is 20072519. The next prime is 20072543. The reversal of 20072520 is 2527002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17189316 + 2883204 = 4146^2 + 1698^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20072493 and 20072502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2536 + ... + 6824.

Almost surely, 2^20072520 is an apocalyptic number.

20072520 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 20072520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35135100).

20072520 is an abundant number, since it is smaller than the sum of its proper divisors (50197680).

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

20072520 is a wasteful number, since it uses less digits than its factorization.

20072520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4319 (or 4312 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

The square root of 20072520 is about 4480.2366008951. The cubic root of 20072520 is about 271.7694485231.

Adding to 20072520 its reverse (2527002), we get a palindrome (22599522).

The spelling of 20072520 in words is "twenty million, seventy-two thousand, five hundred twenty".