20204140402 has 4 divisors (see below), whose sum is σ = 30306210606. Its totient is φ = 10102070200.

The previous prime is 20204140343. The next prime is 20204140469. The reversal of 20204140402 is 20404140202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20175077521 + 29062881 = 142039^2 + 5391^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20204140402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5051035099 + ... + 5051035102.

Almost surely, 2^20204140402 is an apocalyptic number.

20204140402 is a deficient number, since it is larger than the sum of its proper divisors (10102070204).

20204140402 is a wasteful number, since it uses less digits than its factorization.

20204140402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10102070203.

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

Adding to 20204140402 its reverse (20404140202), we get a palindrome (40608280604).

The spelling of 20204140402 in words is "twenty billion, two hundred four million, one hundred forty thousand, four hundred two".