10809020 has 24 divisors (see below), whose sum is σ = 22927968. Its totient is φ = 4280000.

The previous prime is 10808999. The next prime is 10809023. The reversal of 10809020 is 2090801.

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 = 10808983 and 10809001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10809023) 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, 656 + ... + 4695.

It is an arithmetic number, because the mean of its divisors is an integer number (955332).

Almost surely, 2^10809020 is an apocalyptic number.

10809020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10809020 is an abundant number, since it is smaller than the sum of its proper divisors (12118948).

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

10809020 is a wasteful number, since it uses less digits than its factorization.

10809020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5461 (or 5459 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 10809020 is about 3287.7074079060. The cubic root of 10809020 is about 221.1034097654.

Adding to 10809020 its reverse (2090801), we get a palindrome (12899821).

The spelling of 10809020 in words is "ten million, eight hundred nine thousand, twenty".