20097440 has 96 divisors (see below), whose sum is σ = 54613440. Its totient is φ = 6912000.

The previous prime is 20097439. The next prime is 20097443. The reversal of 20097440 is 4479002.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20097443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33140 + ... + 33740.

It is an arithmetic number, because the mean of its divisors is an integer number (568890).

Almost surely, 2^20097440 is an apocalyptic number.

20097440 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 20097440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27306720).

20097440 is an abundant number, since it is smaller than the sum of its proper divisors (34516000).

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

20097440 is a wasteful number, since it uses less digits than its factorization.

20097440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20097440 is about 4483.0168413692. The cubic root of 20097440 is about 271.8818691179.

It can be divided in two parts, 2009 and 7440, that added together give a palindrome (9449).

The spelling of 20097440 in words is "twenty million, ninety-seven thousand, four hundred forty".