20040516 has 72 divisors (see below), whose sum is σ = 54119520. Its totient is φ = 6234624.

The previous prime is 20040509. The next prime is 20040523. The reversal of 20040516 is 61504002.

20040516 = T₆₅₃ + T₆₅₄ + ... + T₇₃₅.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20040509) and next prime (20040523).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56596 + ... + 56948.

It is an arithmetic number, because the mean of its divisors is an integer number (751660).

Almost surely, 2^20040516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20040516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27059760).

20040516 is an abundant number, since it is smaller than the sum of its proper divisors (34079004).

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

20040516 is a wasteful number, since it uses less digits than its factorization.

20040516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20040516 is about 4476.6634896986. The cubic root of 20040516 is about 271.6249335988.

Adding to 20040516 its reverse (61504002), we get a palindrome (81544518).

The spelling of 20040516 in words is "twenty million, forty thousand, five hundred sixteen".