20400042422402 has 4 divisors (see below), whose sum is σ = 30600063633606. Its totient is φ = 10200021211200.

The previous prime is 20400042422351. The next prime is 20400042422413. The reversal of 20400042422402 is 20422424000402.

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., 15551815329241 + 4848227093161 = 3943579^2 + 2201869^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100010605599 + ... + 5100010605602.

Almost surely, 2^{20400042422402} is an apocalyptic number.

20400042422402 is a deficient number, since it is larger than the sum of its proper divisors (10200021211204).

20400042422402 is a wasteful number, since it uses less digits than its factorization.

20400042422402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10200021211203.

The product of its (nonzero) digits is 8192, while the sum is 26.

Adding to 20400042422402 its reverse (20422424000402), we get a palindrome (40822466422804).

The spelling of 20400042422402 in words is "twenty trillion, four hundred billion, forty-two million, four hundred twenty-two thousand, four hundred two".