20701928 has 32 divisors (see below), whose sum is σ = 42440160. Its totient is φ = 9408960.

The previous prime is 20701921. The next prime is 20701951. The reversal of 20701928 is 82910702.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20701928.

It is not an unprimeable number, because it can be changed into a prime (20701921) 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, 5483 + ... + 8453.

It is an arithmetic number, because the mean of its divisors is an integer number (1326255).

Almost surely, 2^20701928 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 20701928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21220080).

20701928 is an abundant number, since it is smaller than the sum of its proper divisors (21738232).

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

20701928 is a wasteful number, since it uses less digits than its factorization.

20701928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057 (or 3053 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20701928 is about 4549.9371424230. The cubic root of 20701928 is about 274.5808623278.

The spelling of 20701928 in words is "twenty million, seven hundred one thousand, nine hundred twenty-eight".