20115040 has 72 divisors (see below), whose sum is σ = 52284960. Its totient is φ = 7307520.

The previous prime is 20115031. The next prime is 20115049. The reversal of 20115040 is 4051102.

It is an interprime number because it is at equal distance from previous prime (20115031) and next prime (20115049).

It is a super-2 number, since 2×20115040² = 809229668403200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20115040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20115049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18841 + ... + 19879.

It is an arithmetic number, because the mean of its divisors is an integer number (726180).

Almost surely, 2^20115040 is an apocalyptic number.

20115040 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 20115040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26142480).

20115040 is an abundant number, since it is smaller than the sum of its proper divisors (32169920).

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

20115040 is a wasteful number, since it uses less digits than its factorization.

20115040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076 (or 1057 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20115040 is about 4484.9793756493. The cubic root of 20115040 is about 271.9612113085.

Adding to 20115040 its reverse (4051102), we get a palindrome (24166142).

The spelling of 20115040 in words is "twenty million, one hundred fifteen thousand, forty".