20708772 has 72 divisors (see below), whose sum is σ = 57647520. Its totient is φ = 5765760.

The previous prime is 20708767. The next prime is 20708777. The reversal of 20708772 is 27780702.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20708767) and next prime (20708777).

It is not an unprimeable number, because it can be changed into a prime (20708777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23679 + ... + 24537.

It is an arithmetic number, because the mean of its divisors is an integer number (800660).

Almost surely, 2^20708772 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 20708772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28823760).

20708772 is an abundant number, since it is smaller than the sum of its proper divisors (36938748).

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

20708772 is a wasteful number, since it uses less digits than its factorization.

20708772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 20708772 is about 4550.6891785750. The cubic root of 20708772 is about 274.6111175512.

The spelling of 20708772 in words is "twenty million, seven hundred eight thousand, seven hundred seventy-two".