20306772 has 36 divisors (see below), whose sum is σ = 54352116. Its totient is φ = 6370560.

The previous prime is 20306771. The next prime is 20306777. The reversal of 20306772 is 27760302.

It can be written as a sum of positive squares in 2 ways, for example, as 12489156 + 7817616 = 3534^2 + 2796^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20306771) 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, 15979 + ... + 17202.

It is an arithmetic number, because the mean of its divisors is an integer number (1509781).

Almost surely, 2^20306772 is an apocalyptic number.

It is an amenable number.

20306772 is an abundant number, since it is smaller than the sum of its proper divisors (34045344).

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

20306772 is a wasteful number, since it uses less digits than its factorization.

20306772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33208 (or 33203 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 20306772 is about 4506.3035849796. The cubic root of 20306772 is about 272.8225711811.

The spelling of 20306772 in words is "twenty million, three hundred six thousand, seven hundred seventy-two".