1820920 has 16 divisors (see below), whose sum is σ = 4097160. Its totient is φ = 728352.

The previous prime is 1820899. The next prime is 1820927. The reversal of 1820920 is 290281.

It is a junction number, because it is equal to n+sod(n) for n = 1820891 and 1820900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820927) 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, 22722 + ... + 22801.

2^1820920 is an apocalyptic number.

1820920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820920 is an abundant number, since it is smaller than the sum of its proper divisors (2276240).

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

1820920 is a wasteful number, since it uses less digits than its factorization.

1820920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45534 (or 45530 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1820920 is about 1349.4146879295. The cubic root of 1820920 is about 122.1134839418.

The spelling of 1820920 in words is "one million, eight hundred twenty thousand, nine hundred twenty".