20402042 has 16 divisors (see below), whose sum is σ = 31518720. Its totient is φ = 9899568.

The previous prime is 20402021. The next prime is 20402087. The reversal of 20402042 is 24020402.

It is a happy 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, 11084 + ... + 12792.

It is an arithmetic number, because the mean of its divisors is an integer number (1969920).

Almost surely, 2^20402042 is an apocalyptic number.

20402042 is a deficient number, since it is larger than the sum of its proper divisors (11116678).

20402042 is a wasteful number, since it uses less digits than its factorization.

20402042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885.

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

The square root of 20402042 is about 4516.8619637974. The cubic root of 20402042 is about 273.2485582160.

Adding to 20402042 its reverse (24020402), we get a palindrome (44422444).

The spelling of 20402042 in words is "twenty million, four hundred two thousand, forty-two".