20097820 has 24 divisors (see below), whose sum is σ = 44427600. Its totient is φ = 7615872.

The previous prime is 20097809. The next prime is 20097823. The reversal of 20097820 is 2879002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20097823) 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, 26065 + ... + 26824.

It is an arithmetic number, because the mean of its divisors is an integer number (1851150).

Almost surely, 2^20097820 is an apocalyptic number.

20097820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20097820 is an abundant number, since it is smaller than the sum of its proper divisors (24329780).

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

20097820 is a wasteful number, since it uses less digits than its factorization.

20097820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52917 (or 52915 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 20097820 is about 4483.0592233429. The cubic root of 20097820 is about 271.8835826770.

The spelling of 20097820 in words is "twenty million, ninety-seven thousand, eight hundred twenty".