20040004040 has 32 divisors (see below), whose sum is σ = 51531439680. Its totient is φ = 6870858432.

The previous prime is 20040004037. The next prime is 20040004051. The reversal of 20040004040 is 4040004002.

It is a Harshad number since it is a multiple of its sum of digits (14).

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, 35785442 + ... + 35786001.

It is an arithmetic number, because the mean of its divisors is an integer number (1610357490).

Almost surely, 2^20040004040 is an apocalyptic number.

20040004040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20040004040 is an abundant number, since it is smaller than the sum of its proper divisors (31491435640).

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

20040004040 is a wasteful number, since it uses less digits than its factorization.

20040004040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71571461 (or 71571457 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

Adding to 20040004040 its reverse (4040004002), we get a palindrome (24080008042).

The spelling of 20040004040 in words is "twenty billion, forty million, four thousand, forty".