20070520 has 32 divisors (see below), whose sum is σ = 45838800. Its totient is φ = 7907328.

The previous prime is 20070509. The next prime is 20070529. The reversal of 20070520 is 2507002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20070494 and 20070503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20070529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1065 + ... + 6424.

Almost surely, 2^20070520 is an apocalyptic number.

20070520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20070520 is an abundant number, since it is smaller than the sum of its proper divisors (25768280).

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

20070520 is a wasteful number, since it uses less digits than its factorization.

20070520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7567 (or 7563 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 16.

The square root of 20070520 is about 4480.0133928371. The cubic root of 20070520 is about 271.7604219709.

Adding to 20070520 its reverse (2507002), we get a palindrome (22577522).

The spelling of 20070520 in words is "twenty million, seventy thousand, five hundred twenty".