20404240040 has 32 divisors (see below), whose sum is σ = 46111805280. Its totient is φ = 8125737792.

The previous prime is 20404240037. The next prime is 20404240063. The reversal of 20404240040 is 4004240402.

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 = 20404239994 and 20404240021.

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, 1114502 + ... + 1132661.

It is an arithmetic number, because the mean of its divisors is an integer number (1440993915).

Almost surely, 2^20404240040 is an apocalyptic number.

20404240040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404240040 is an abundant number, since it is smaller than the sum of its proper divisors (25707565240).

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

20404240040 is a wasteful number, since it uses less digits than its factorization.

20404240040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247401 (or 2247397 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 20404240040 its reverse (4004240402), we get a palindrome (24408480442).

The spelling of 20404240040 in words is "twenty billion, four hundred four million, two hundred forty thousand, forty".