20298240 has 120 divisors (see below), whose sum is σ = 70378308. Its totient is φ = 5406720.

The previous prime is 20298233. The next prime is 20298241. The reversal of 20298240 is 4289202.

It can be written as a sum of positive squares in 2 ways, for example, as 19079424 + 1218816 = 4368^2 + 1104^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a hoax number, since the sum of its digits (27) 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 (20298241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22600 + ... + 23480.

Almost surely, 2^20298240 is an apocalyptic number.

20298240 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 20298240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35189154).

20298240 is an abundant number, since it is smaller than the sum of its proper divisors (50080068).

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

20298240 is an equidigital number, since it uses as much as digits as its factorization.

20298240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910 (or 891 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20298240 is about 4505.3568116188. The cubic root of 20298240 is about 272.7843565360.

The spelling of 20298240 in words is "twenty million, two hundred ninety-eight thousand, two hundred forty".