20733280 has 48 divisors (see below), whose sum is σ = 49505904. Its totient is φ = 8204800.

The previous prime is 20733259. The next prime is 20733337. The reversal of 20733280 is 8233702.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15519 + ... + 16801.

It is an arithmetic number, because the mean of its divisors is an integer number (1031373).

Almost surely, 2^20733280 is an apocalyptic number.

20733280 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 20733280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24752952).

20733280 is an abundant number, since it is smaller than the sum of its proper divisors (28772624).

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

20733280 is a wasteful number, since it uses less digits than its factorization.

20733280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399 (or 1391 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20733280 is about 4553.3811612910. The cubic root of 20733280 is about 274.7194052541.

Adding to 20733280 its reverse (8233702), we get a palindrome (28966982).

The spelling of 20733280 in words is "twenty million, seven hundred thirty-three thousand, two hundred eighty".