20042040 has 32 divisors (see below), whose sum is σ = 60126480. Its totient is φ = 5344512.

The previous prime is 20041981. The next prime is 20042041. The reversal of 20042040 is 4024002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83389 + ... + 83628.

Almost surely, 2^20042040 is an apocalyptic number.

20042040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20042040 is an abundant number, since it is smaller than the sum of its proper divisors (40084440).

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

20042040 is a wasteful number, since it uses less digits than its factorization.

20042040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167031 (or 167027 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 20042040 is about 4476.8337025179. The cubic root of 20042040 is about 271.6318187493.

Adding to 20042040 its reverse (4024002), we get a palindrome (24066042).

The spelling of 20042040 in words is "twenty million, forty-two thousand, forty".