20400213400444 has 24 divisors (see below), whose sum is σ = 35892596416320. Its totient is φ = 10145322644544.

The previous prime is 20400213400381. The next prime is 20400213400493. The reversal of 20400213400444 is 44400431200402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16502004 + ... + 17695099.

It is an arithmetic number, because the mean of its divisors is an integer number (1495524850680).

Almost surely, 2^{20400213400444} is an apocalyptic number.

It is an amenable number.

20400213400444 is a deficient number, since it is larger than the sum of its proper divisors (15492383015876).

20400213400444 is a wasteful number, since it uses less digits than its factorization.

20400213400444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34197909 (or 34197907 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 20400213400444 its reverse (44400431200402), we get a palindrome (64800644600846).

The spelling of 20400213400444 in words is "twenty trillion, four hundred billion, two hundred thirteen million, four hundred thousand, four hundred forty-four".