20830520 has 16 divisors (see below), whose sum is σ = 46868760. Its totient is φ = 8332192.

The previous prime is 20830507. The next prime is 20830529. The reversal of 20830520 is 2503802.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20830492 and 20830501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20830529) 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, 260342 + ... + 260421.

Almost surely, 2^20830520 is an apocalyptic number.

20830520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20830520 is an abundant number, since it is smaller than the sum of its proper divisors (26038240).

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

20830520 is a wasteful number, since it uses less digits than its factorization.

20830520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520774 (or 520770 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20830520 is about 4564.0464502457. The cubic root of 20830520 is about 275.1482176210.

The spelling of 20830520 in words is "twenty million, eight hundred thirty thousand, five hundred twenty".