20404242222400 has 84 divisors (see below), whose sum is σ = 50214030831580. Its totient is φ = 8160584601600.

The previous prime is 20404242222379. The next prime is 20404242222443. The reversal of 20404242222400 is 422224240402.

It can be written as a sum of positive squares in 6 ways, for example, as 2761419709504 + 17642822512896 = 1661752^2 + 4200336^2 .

It is a congruent number.

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, 10925110 + ... + 12655690.

Almost surely, 2^{20404242222400} is an apocalyptic number.

20404242222400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404242222400 is an abundant number, since it is smaller than the sum of its proper divisors (29809788609180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20404242222400 is a wasteful number, since it uses less digits than its factorization.

20404242222400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1737972 (or 1737957 counting only the distinct ones).

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

Adding to 20404242222400 its reverse (422224240402), we get a palindrome (20826466462802).

The spelling of 20404242222400 in words is "twenty trillion, four hundred four billion, two hundred forty-two million, two hundred twenty-two thousand, four hundred".