20400104402 has 8 divisors (see below), whose sum is σ = 31346502012. Its totient is φ = 9951270400.

The previous prime is 20400104393. The next prime is 20400104411. The reversal of 20400104402 is 20440100402.

It is an interprime number because it is at equal distance from previous prime (20400104393) and next prime (20400104411).

It can be written as a sum of positive squares in 2 ways, for example, as 20263237801 + 136866601 = 142349^2 + 11699^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20400104402² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124390799 + ... + 124390962.

Almost surely, 2^20400104402 is an apocalyptic number.

20400104402 is a deficient number, since it is larger than the sum of its proper divisors (10946397610).

20400104402 is a wasteful number, since it uses less digits than its factorization.

20400104402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248781804.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 20400104402 its reverse (20440100402), we get a palindrome (40840204804).

The spelling of 20400104402 in words is "twenty billion, four hundred million, one hundred four thousand, four hundred two".