20744220 has 48 divisors (see below), whose sum is σ = 66382848. Its totient is φ = 4741440.

The previous prime is 20744173. The next prime is 20744231. The reversal of 20744220 is 2244702.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 24276 + ... + 25115.

It is an arithmetic number, because the mean of its divisors is an integer number (1382976).

Almost surely, 2^20744220 is an apocalyptic number.

20744220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20744220 is an abundant number, since it is smaller than the sum of its proper divisors (45638628).

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

20744220 is a wasteful number, since it uses less digits than its factorization.

20744220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49410 (or 49408 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 20744220 is about 4554.5823079619. The cubic root of 20744220 is about 274.7677156973.

Adding to 20744220 its reverse (2244702), we get a palindrome (22988922).

The spelling of 20744220 in words is "twenty million, seven hundred forty-four thousand, two hundred twenty".