20144515440 has 120 divisors (see below), whose sum is σ = 72643631760. Its totient is φ = 4604457984.

The previous prime is 20144515421. The next prime is 20144515453. The reversal of 20144515440 is 4451544102.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20144515398 and 20144515407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 844725 + ... + 868244.

It is an arithmetic number, because the mean of its divisors is an integer number (605363598).

Almost surely, 2^20144515440 is an apocalyptic number.

20144515440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20144515440 is an abundant number, since it is smaller than the sum of its proper divisors (52499116320).

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

20144515440 is a wasteful number, since it uses less digits than its factorization.

20144515440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712999 (or 1712986 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The spelling of 20144515440 in words is "twenty billion, one hundred forty-four million, five hundred fifteen thousand, four hundred forty".