20216040 has 64 divisors (see below), whose sum is σ = 65318400. Its totient is φ = 4975872.

The previous prime is 20216033. The next prime is 20216047. The reversal of 20216040 is 4061202.

It is an interprime number because it is at equal distance from previous prime (20216033) and next prime (20216047).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (20216047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4920 + ... + 8039.

It is an arithmetic number, because the mean of its divisors is an integer number (1020600).

Almost surely, 2^20216040 is an apocalyptic number.

20216040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20216040 is an abundant number, since it is smaller than the sum of its proper divisors (45102360).

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

20216040 is a wasteful number, since it uses less digits than its factorization.

20216040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12986 (or 12982 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20216040 is about 4496.2250833338. The cubic root of 20216040 is about 272.4156347425.

Adding to 20216040 its reverse (4061202), we get a palindrome (24277242).

The spelling of 20216040 in words is "twenty million, two hundred sixteen thousand, forty".