20404455144 has 16 divisors (see below), whose sum is σ = 51011137920. Its totient is φ = 6801485040.

The previous prime is 20404455131. The next prime is 20404455163. The reversal of 20404455144 is 44155440402.

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, 425092792 + ... + 425092839.

It is an arithmetic number, because the mean of its divisors is an integer number (3188196120).

Almost surely, 2^20404455144 is an apocalyptic number.

20404455144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20404455144 is an abundant number, since it is smaller than the sum of its proper divisors (30606682776).

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

20404455144 is a wasteful number, since it uses less digits than its factorization.

20404455144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850185640 (or 850185636 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 33.

Adding to 20404455144 its reverse (44155440402), we get a palindrome (64559895546).

The spelling of 20404455144 in words is "twenty billion, four hundred four million, four hundred fifty-five thousand, one hundred forty-four".