40105020 has 24 divisors (see below), whose sum is σ = 112294224. Its totient is φ = 10694656.

The previous prime is 40105001. The next prime is 40105049. The reversal of 40105020 is 2050104.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 40104987 and 40105005.

It is a congruent number.

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, 334149 + ... + 334268.

It is an arithmetic number, because the mean of its divisors is an integer number (4678926).

Almost surely, 2^40105020 is an apocalyptic number.

It is an amenable number.

40105020 is an abundant number, since it is smaller than the sum of its proper divisors (72189204).

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

40105020 is a wasteful number, since it uses less digits than its factorization.

40105020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668429 (or 668427 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 40105020 is about 6332.8524378829. The cubic root of 40105020 is about 342.2942305668.

Adding to 40105020 its reverse (2050104), we get a palindrome (42155124).

The spelling of 40105020 in words is "forty million, one hundred five thousand, twenty".