20530820 has 48 divisors (see below), whose sum is σ = 44513280. Its totient is φ = 7951104.

The previous prime is 20530793. The next prime is 20530837. The reversal of 20530820 is 2803502.

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 = 20530792 and 20530801.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149792 + ... + 149928.

It is an arithmetic number, because the mean of its divisors is an integer number (927360).

Almost surely, 2^20530820 is an apocalyptic number.

20530820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20530820 is an abundant number, since it is smaller than the sum of its proper divisors (23982460).

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

20530820 is a wasteful number, since it uses less digits than its factorization.

20530820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 330 counting only the distinct ones).

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

The square root of 20530820 is about 4531.0947904452. The cubic root of 20530820 is about 273.8222691676.

The spelling of 20530820 in words is "twenty million, five hundred thirty thousand, eight hundred twenty".