20533416 has 64 divisors (see below), whose sum is σ = 55339200. Its totient is φ = 6325248.

The previous prime is 20533391. The next prime is 20533427. The reversal of 20533416 is 61433502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23646 + ... + 24498.

It is an arithmetic number, because the mean of its divisors is an integer number (864675).

Almost surely, 2^20533416 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 20533416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27669600).

20533416 is an abundant number, since it is smaller than the sum of its proper divisors (34805784).

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

20533416 is a wasteful number, since it uses less digits than its factorization.

20533416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20533416 is about 4531.3812463751. The cubic root of 20533416 is about 273.8338097466.

Adding to 20533416 its reverse (61433502), we get a palindrome (81966918).

The spelling of 20533416 in words is "twenty million, five hundred thirty-three thousand, four hundred sixteen".