20040004240 has 20 divisors (see below), whose sum is σ = 46593010044. Its totient is φ = 8016001664.

The previous prime is 20040004189. The next prime is 20040004291. The reversal of 20040004240 is 4240004002.

It is an interprime number because it is at equal distance from previous prime (20040004189) and next prime (20040004291).

It can be written as a sum of positive squares in 2 ways, for example, as 5271921664 + 14768082576 = 72608^2 + 121524^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 125249947 + ... + 125250106.

Almost surely, 2^20040004240 is an apocalyptic number.

20040004240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20040004240 is an abundant number, since it is smaller than the sum of its proper divisors (26553005804).

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

20040004240 is a wasteful number, since it uses less digits than its factorization.

20040004240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250500066 (or 250500060 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

Adding to 20040004240 its reverse (4240004002), we get a palindrome (24280008242).

The spelling of 20040004240 in words is "twenty billion, forty million, four thousand, two hundred forty".