100206520 has 16 divisors (see below), whose sum is σ = 225464760. Its totient is φ = 40082592.

The previous prime is 100206511. The next prime is 100206521. The reversal of 100206520 is 25602001.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 100206494 and 100206503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100206521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1252542 + ... + 1252621.

Almost surely, 2^100206520 is an apocalyptic number.

100206520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100206520 is an abundant number, since it is smaller than the sum of its proper divisors (125258240).

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

100206520 is a wasteful number, since it uses less digits than its factorization.

100206520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2505174 (or 2505170 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 100206520 is about 10010.3206741842. The cubic root of 100206520 is about 464.4781906262.

Adding to 100206520 its reverse (25602001), we get a palindrome (125808521).

The spelling of 100206520 in words is "one hundred million, two hundred six thousand, five hundred twenty".