20650872 has 128 divisors (see below), whose sum is σ = 62208000. Its totient is φ = 5639040.

The previous prime is 20650841. The next prime is 20650909. The reversal of 20650872 is 27805602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115279 + ... + 115457.

It is an arithmetic number, because the mean of its divisors is an integer number (486000).

Almost surely, 2^20650872 is an apocalyptic number.

20650872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20650872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31104000).

20650872 is an abundant number, since it is smaller than the sum of its proper divisors (41557128).

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

20650872 is a wasteful number, since it uses less digits than its factorization.

20650872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 20650872 is about 4544.3230518967. The cubic root of 20650872 is about 274.3549487304.

The spelling of 20650872 in words is "twenty million, six hundred fifty thousand, eight hundred seventy-two".