20420142 has 16 divisors (see below), whose sum is σ = 40892880. Its totient is φ = 6797952.

The previous prime is 20420129. The next prime is 20420167. The reversal of 20420142 is 24102402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4368 + ... + 7740.

It is an arithmetic number, because the mean of its divisors is an integer number (2555805).

Almost surely, 2^20420142 is an apocalyptic number.

20420142 is an abundant number, since it is smaller than the sum of its proper divisors (20472738).

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

20420142 is a wasteful number, since it uses less digits than its factorization.

20420142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4387.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20420142 is about 4518.8651230148. The cubic root of 20420142 is about 273.3293399509.

Adding to 20420142 its reverse (24102402), we get a palindrome (44522544).

The spelling of 20420142 in words is "twenty million, four hundred twenty thousand, one hundred forty-two".