20401020040 has 64 divisors (see below), whose sum is σ = 47739916800. Its totient is φ = 7839307008.

The previous prime is 20401020037. The next prime is 20401020083. The reversal of 20401020040 is 4002010402.

It is a self number, because there is not a number n which added to its sum of digits gives 20401020040.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29677 + ... + 204163.

It is an arithmetic number, because the mean of its divisors is an integer number (745936200).

Almost surely, 2^20401020040 is an apocalyptic number.

20401020040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20401020040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23869958400).

20401020040 is an abundant number, since it is smaller than the sum of its proper divisors (27338896760).

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

20401020040 is a wasteful number, since it uses less digits than its factorization.

20401020040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174614 (or 174610 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 20401020040 its reverse (4002010402), we get a palindrome (24403030442).

The spelling of 20401020040 in words is "twenty billion, four hundred one million, twenty thousand, forty".