20716428 has 24 divisors (see below), whose sum is σ = 49251888. Its totient is φ = 6774976.

The previous prime is 20716417. The next prime is 20716429. The reversal of 20716428 is 82461702.

It is a junction number, because it is equal to n+sod(n) for n = 20716395 and 20716404.

It is not an unprimeable number, because it can be changed into a prime (20716429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15651 + ... + 16922.

It is an arithmetic number, because the mean of its divisors is an integer number (2052162).

Almost surely, 2^20716428 is an apocalyptic number.

It is an amenable number.

20716428 is an abundant number, since it is smaller than the sum of its proper divisors (28535460).

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

20716428 is a wasteful number, since it uses less digits than its factorization.

20716428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32633 (or 32631 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20716428 is about 4551.5302921106. The cubic root of 20716428 is about 274.6449544792.

The spelling of 20716428 in words is "twenty million, seven hundred sixteen thousand, four hundred twenty-eight".