20125520 has 40 divisors (see below), whose sum is σ = 47066184. Its totient is φ = 8003072.

The previous prime is 20125519. The next prime is 20125537. The reversal of 20125520 is 2552102.

It can be written as a sum of positive squares in 4 ways, for example, as 8809024 + 11316496 = 2968^2 + 3364^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-4 number, since 4×20125520⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15122 + ... + 16398.

Almost surely, 2^20125520 is an apocalyptic number.

20125520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20125520 is an abundant number, since it is smaller than the sum of its proper divisors (26940664).

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

20125520 is a wasteful number, since it uses less digits than its factorization.

20125520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487 (or 1481 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20125520 is about 4486.1475677913. The cubic root of 20125520 is about 272.0084339945.

Adding to 20125520 its reverse (2552102), we get a palindrome (22677622).

The spelling of 20125520 in words is "twenty million, one hundred twenty-five thousand, five hundred twenty".