20453820 has 24 divisors (see below), whose sum is σ = 57270864. Its totient is φ = 5454336.

The previous prime is 20453809. The next prime is 20453821. The reversal of 20453820 is 2835402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20453821) 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, 170389 + ... + 170508.

It is an arithmetic number, because the mean of its divisors is an integer number (2386286).

Almost surely, 2^20453820 is an apocalyptic number.

20453820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20453820 is an abundant number, since it is smaller than the sum of its proper divisors (36817044).

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

20453820 is a wasteful number, since it uses less digits than its factorization.

20453820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340909 (or 340907 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20453820 is about 4522.5899659377. The cubic root of 20453820 is about 273.4795205843.

The spelling of 20453820 in words is "twenty million, four hundred fifty-three thousand, eight hundred twenty".