20102520 has 32 divisors (see below), whose sum is σ = 60307920. Its totient is φ = 5360640.

The previous prime is 20102503. The next prime is 20102527. The reversal of 20102520 is 2520102.

It is a super-2 number, since 2×20102520² = 808222620700800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20102496 and 20102505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102527) 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, 83641 + ... + 83880.

Almost surely, 2^20102520 is an apocalyptic number.

20102520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20102520 is an abundant number, since it is smaller than the sum of its proper divisors (40205400).

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

20102520 is a wasteful number, since it uses less digits than its factorization.

20102520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167535 (or 167531 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20102520 is about 4483.5833883179. The cubic root of 20102520 is about 271.9047749132.

Adding to 20102520 its reverse (2520102), we get a palindrome (22622622).

The spelling of 20102520 in words is "twenty million, one hundred two thousand, five hundred twenty".