20011800040 has 32 divisors (see below), whose sum is σ = 45112690080. Its totient is φ = 7989406272.

The previous prime is 20011800023. The next prime is 20011800071. The reversal of 20011800040 is 4000811002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20011799987 and 20011800023.

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, 457374 + ... + 499213.

It is an arithmetic number, because the mean of its divisors is an integer number (1409771565).

Almost surely, 2^20011800040 is an apocalyptic number.

20011800040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011800040 is an abundant number, since it is smaller than the sum of its proper divisors (25100890040).

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

20011800040 is a wasteful number, since it uses less digits than its factorization.

20011800040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957121 (or 957117 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The spelling of 20011800040 in words is "twenty billion, eleven million, eight hundred thousand, forty".