20771072 has 72 divisors (see below), whose sum is σ = 48369216. Its totient is φ = 8718336.

The previous prime is 20771057. The next prime is 20771081. The reversal of 20771072 is 27017702.

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, 119978 + ... + 120150.

Almost surely, 2^20771072 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 20771072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24184608).

20771072 is an abundant number, since it is smaller than the sum of its proper divisors (27598144).

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

20771072 is an equidigital number, since it uses as much as digits as its factorization.

20771072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 26.

The square root of 20771072 is about 4557.5291551454. The cubic root of 20771072 is about 274.8862206997.

Adding to 20771072 its reverse (27017702), we get a palindrome (47788774).

The spelling of 20771072 in words is "twenty million, seven hundred seventy-one thousand, seventy-two".