20120404402 has 24 divisors (see below), whose sum is σ = 35113419756. Its totient is φ = 8621712288.

The previous prime is 20120404313. The next prime is 20120404433. The reversal of 20120404402 is 20440402102.

It can be written as a sum of positive squares in 2 ways, for example, as 20118869281 + 1535121 = 141841^2 + 1239^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20120404402.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 899668 + ... + 921760.

Almost surely, 2^20120404402 is an apocalyptic number.

20120404402 is a deficient number, since it is larger than the sum of its proper divisors (14993015354).

20120404402 is a wasteful number, since it uses less digits than its factorization.

20120404402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31402 (or 31395 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 20120404402 its reverse (20440402102), we get a palindrome (40560806504).

The spelling of 20120404402 in words is "twenty billion, one hundred twenty million, four hundred four thousand, four hundred two".