20774912 has 34 divisors (see below), whose sum is σ = 41680578. Its totient is φ = 10354688.

The previous prime is 20774909. The next prime is 20774917. The reversal of 20774912 is 21947702.

It can be written as a sum of positive squares in only one way, i.e., 12845056 + 7929856 = 3584^2 + 2816^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20774917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65378 + ... + 65694.

Almost surely, 2^20774912 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 20774912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20840289).

20774912 is an abundant number, since it is smaller than the sum of its proper divisors (20905666).

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

20774912 is an frugal number, since it uses more digits than its factorization.

20774912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 20774912 is about 4557.9504165798. The cubic root of 20774912 is about 274.9031592902.

The spelling of 20774912 in words is "twenty million, seven hundred seventy-four thousand, nine hundred twelve".