20042190 has 96 divisors (see below), whose sum is σ = 61663680. Its totient is φ = 4419072.

The previous prime is 20042173. The next prime is 20042249. The reversal of 20042190 is 9124002.

It is a super-2 number, since 2×20042190² = 803378759992200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17722 + ... + 18818.

It is an arithmetic number, because the mean of its divisors is an integer number (642330).

Almost surely, 2^20042190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20042190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30831840).

20042190 is an abundant number, since it is smaller than the sum of its proper divisors (41621490).

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

20042190 is a wasteful number, since it uses less digits than its factorization.

20042190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146 (or 1143 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20042190 is about 4476.8504553983. The cubic root of 20042190 is about 271.6324964027.

Adding to 20042190 its reverse (9124002), we get a palindrome (29166192).

The spelling of 20042190 in words is "twenty million, forty-two thousand, one hundred ninety".