20420042 has 8 divisors (see below), whose sum is σ = 30697056. Its totient is φ = 10187692.

The previous prime is 20420033. The next prime is 20420051. The reversal of 20420042 is 24002402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20420033) and next prime (20420051).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20419999 and 20420026.

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, 9998 + ... + 11865.

It is an arithmetic number, because the mean of its divisors is an integer number (3837132).

Almost surely, 2^20420042 is an apocalyptic number.

20420042 is a deficient number, since it is larger than the sum of its proper divisors (10277014).

20420042 is a wasteful number, since it uses less digits than its factorization.

20420042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22332.

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

The square root of 20420042 is about 4518.8540582763. The cubic root of 20420042 is about 273.3288937741.

Adding to 20420042 its reverse (24002402), we get a palindrome (44422444).

The spelling of 20420042 in words is "twenty million, four hundred twenty thousand, forty-two".