20775072 has 72 divisors (see below), whose sum is σ = 57498336. Its totient is φ = 6555648.

The previous prime is 20775061. The next prime is 20775077. The reversal of 20775072 is 27057702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 214128 + ... + 214224.

It is an arithmetic number, because the mean of its divisors is an integer number (798588).

Almost surely, 2^20775072 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 20775072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28749168).

20775072 is an abundant number, since it is smaller than the sum of its proper divisors (36723264).

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

20775072 is an equidigital number, since it uses as much as digits as its factorization.

20775072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 6860, while the sum is 30.

The square root of 20775072 is about 4557.9679682946. The cubic root of 20775072 is about 274.9038650195.

The spelling of 20775072 in words is "twenty million, seven hundred seventy-five thousand, seventy-two".