1544040020 has 24 divisors (see below), whose sum is σ = 3245512704. Its totient is φ = 617039136.

The previous prime is 1544039999. The next prime is 1544040097. The reversal of 1544040020 is 200404451.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1544039974 and 1544040001.

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, 13772 + ... + 57251.

It is an arithmetic number, because the mean of its divisors is an integer number (135229696).

Almost surely, 2^1544040020 is an apocalyptic number.

1544040020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1544040020 is an abundant number, since it is smaller than the sum of its proper divisors (1701472684).

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

1544040020 is a wasteful number, since it uses less digits than its factorization.

1544040020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72119 (or 72117 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 1544040020 is about 39294.2746465691. The cubic root of 1544040020 is about 1155.8092989304.

Adding to 1544040020 its reverse (200404451), we get a palindrome (1744444471).

The spelling of 1544040020 in words is "one billion, five hundred forty-four million, forty thousand, twenty".