20020402440040 has 32 divisors (see below), whose sum is σ = 45121868284680. Its totient is φ = 7994656479232.

The previous prime is 20020402440007. The next prime is 20020402440089. The reversal of 20020402440040 is 4004420402002.

It can be written as a sum of positive squares in 4 ways, for example, as 12810629689636 + 7209772750404 = 3579194^2 + 2685102^2 .

It is a super-2 number, since 2×20020402440040² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20020402439993 and 20020402440020.

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, 421991509 + ... + 422038948.

Almost surely, 2^{20020402440040} is an apocalyptic number.

20020402440040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20020402440040 is an abundant number, since it is smaller than the sum of its proper divisors (25101465844640).

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

20020402440040 is a wasteful number, since it uses less digits than its factorization.

20020402440040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844031061 (or 844031057 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 22.

Adding to 20020402440040 its reverse (4004420402002), we get a palindrome (24024822842042).

The spelling of 20020402440040 in words is "twenty trillion, twenty billion, four hundred two million, four hundred forty thousand, forty".