20242040 has 128 divisors (see below), whose sum is σ = 57576960. Its totient is φ = 6234624.

The previous prime is 20242031. The next prime is 20242051. The reversal of 20242040 is 4024202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243839 + ... + 243921.

It is an arithmetic number, because the mean of its divisors is an integer number (449820).

Almost surely, 2^20242040 is an apocalyptic number.

20242040 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 20242040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28788480).

20242040 is an abundant number, since it is smaller than the sum of its proper divisors (37334920).

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

20242040 is a wasteful number, since it uses less digits than its factorization.

20242040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 20242040 is about 4499.1154686227. The cubic root of 20242040 is about 272.5323699728.

Adding to 20242040 its reverse (4024202), we get a palindrome (24266242).

The spelling of 20242040 in words is "twenty million, two hundred forty-two thousand, forty".