20400023144 has 32 divisors (see below), whose sum is σ = 40017438720. Its totient is φ = 9731025216.

The previous prime is 20400023129. The next prime is 20400023207. The reversal of 20400023144 is 44132000402.

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, 74267 + ... + 215210.

It is an arithmetic number, because the mean of its divisors is an integer number (1250544960).

Almost surely, 2^20400023144 is an apocalyptic number.

It is an amenable number.

20400023144 is a deficient number, since it is larger than the sum of its proper divisors (19617415576).

20400023144 is a wasteful number, since it uses less digits than its factorization.

20400023144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289889 (or 289885 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20400023144 its reverse (44132000402), we get a palindrome (64532023546).

The spelling of 20400023144 in words is "twenty billion, four hundred million, twenty-three thousand, one hundred forty-four".