20097280 has 72 divisors (see below), whose sum is σ = 55040832. Its totient is φ = 6887424.

The previous prime is 20097263. The next prime is 20097293. The reversal of 20097280 is 8279002.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7839 + ... + 10081.

It is an arithmetic number, because the mean of its divisors is an integer number (764456).

Almost surely, 2^20097280 is an apocalyptic number.

20097280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20097280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27520416).

20097280 is an abundant number, since it is smaller than the sum of its proper divisors (34943552).

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

20097280 is an equidigital number, since it uses as much as digits as its factorization.

20097280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271 (or 2257 counting only the distinct ones).

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

The square root of 20097280 is about 4482.9989962078. The cubic root of 20097280 is about 271.8811476128.

The spelling of 20097280 in words is "twenty million, ninety-seven thousand, two hundred eighty".