20400442200442 has 16 divisors (see below), whose sum is σ = 30906074924712. Its totient is φ = 10098433139200.

The previous prime is 20400442200421. The next prime is 20400442200443. The reversal of 20400442200442 is 24400224400402.

It can be written as a sum of positive squares in 4 ways, for example, as 15223411154961 + 5177031045481 = 3901719^2 + 2275309^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20400442200442.

It is not an unprimeable number, because it can be changed into a prime (20400442200443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1403983 + ... + 6540034.

Almost surely, 2^{20400442200442} is an apocalyptic number.

20400442200442 is a deficient number, since it is larger than the sum of its proper divisors (10505632724270).

20400442200442 is a wasteful number, since it uses less digits than its factorization.

20400442200442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7956833.

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 20400442200442 its reverse (24400224400402), we get a palindrome (44800666600844).

The spelling of 20400442200442 in words is "twenty trillion, four hundred billion, four hundred forty-two million, two hundred thousand, four hundred forty-two".