20042420 has 12 divisors (see below), whose sum is σ = 42089124. Its totient is φ = 8016960.

The previous prime is 20042417. The next prime is 20042443. The reversal of 20042420 is 2424002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9205156 + 10837264 = 3034^2 + 3292^2 .

It is a hoax number, since the sum of its digits (14) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20042395 and 20042404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501041 + ... + 501080.

It is an arithmetic number, because the mean of its divisors is an integer number (3507427).

Almost surely, 2^20042420 is an apocalyptic number.

20042420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20042420 is an abundant number, since it is smaller than the sum of its proper divisors (22046704).

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

20042420 is a wasteful number, since it uses less digits than its factorization.

20042420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002130 (or 1002128 counting only the distinct ones).

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

The square root of 20042420 is about 4476.8761430265. The cubic root of 20042420 is about 271.6335354647.

Adding to 20042420 its reverse (2424002), we get a palindrome (22466422).

The spelling of 20042420 in words is "twenty million, forty-two thousand, four hundred twenty".