40120020 has 72 divisors (see below), whose sum is σ = 128113440. Its totient is φ = 10134720.

The previous prime is 40120009. The next prime is 40120033. The reversal of 40120020 is 2002104.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 40119984 and 40120011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2446 + ... + 9285.

Almost surely, 2^40120020 is an apocalyptic number.

It is an amenable number.

40120020 is an abundant number, since it is smaller than the sum of its proper divisors (87993420).

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

40120020 is a wasteful number, since it uses less digits than its factorization.

40120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11765 (or 11760 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 40120020 is about 6334.0366276175. The cubic root of 40120020 is about 342.3368999838.

Adding to 40120020 its reverse (2002104), we get a palindrome (42122124).

The spelling of 40120020 in words is "forty million, one hundred twenty thousand, twenty".