20579688 has 48 divisors (see below), whose sum is σ = 56798820. Its totient is φ = 6729216.

The previous prime is 20579683. The next prime is 20579693. The reversal of 20579688 is 88697502.

It is an interprime number because it is at equal distance from previous prime (20579683) and next prime (20579693).

It can be written as a sum of positive squares in 2 ways, for example, as 17489124 + 3090564 = 4182^2 + 1758^2 .

It is not an unprimeable number, because it can be changed into a prime (20579683) 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, 1120 + ... + 6512.

Almost surely, 2^20579688 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 20579688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28399410).

20579688 is an abundant number, since it is smaller than the sum of its proper divisors (36219132).

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

20579688 is a wasteful number, since it uses less digits than its factorization.

20579688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5458 (or 5451 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 20579688 is about 4536.4841011515. The cubic root of 20579688 is about 274.0393500237.

The spelling of 20579688 in words is "twenty million, five hundred seventy-nine thousand, six hundred eighty-eight".