20933928 has 96 divisors (see below), whose sum is σ = 59754240. Its totient is φ = 6612480.

The previous prime is 20933923. The next prime is 20933929. The reversal of 20933928 is 82933902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20933892 and 20933901.

It is not an unprimeable number, because it can be changed into a prime (20933921) 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, 185200 + ... + 185312.

It is an arithmetic number, because the mean of its divisors is an integer number (622440).

Almost surely, 2^20933928 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 20933928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29877120).

20933928 is an abundant number, since it is smaller than the sum of its proper divisors (38820312).

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

20933928 is a wasteful number, since it uses less digits than its factorization.

20933928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 20933928 is about 4575.3609693662. The cubic root of 20933928 is about 275.6027681947.

The spelling of 20933928 in words is "twenty million, nine hundred thirty-three thousand, nine hundred twenty-eight".