20400420442 has 16 divisors (see below), whose sum is σ = 31629448800. Its totient is φ = 9862939440.

The previous prime is 20400420433. The next prime is 20400420463. The reversal of 20400420442 is 24402400402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1409892 + ... + 1424287.

It is an arithmetic number, because the mean of its divisors is an integer number (1976840550).

Almost surely, 2^20400420442 is an apocalyptic number.

20400420442 is a deficient number, since it is larger than the sum of its proper divisors (11229028358).

20400420442 is a wasteful number, since it uses less digits than its factorization.

20400420442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834301.

The product of its (nonzero) digits is 2048, while the sum is 22.

Adding to 20400420442 its reverse (24402400402), we get a palindrome (44802820844).

The spelling of 20400420442 in words is "twenty billion, four hundred million, four hundred twenty thousand, four hundred forty-two".