20213928 has 128 divisors (see below), whose sum is σ = 66528000. Its totient is φ = 5564160.

The previous prime is 20213923. The next prime is 20213959. The reversal of 20213928 is 82931202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20213923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43618 + ... + 44078.

It is an arithmetic number, because the mean of its divisors is an integer number (519750).

Almost surely, 2^20213928 is an apocalyptic number.

20213928 is a gapful number since it is divisible by the number (28) 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 20213928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33264000).

20213928 is an abundant number, since it is smaller than the sum of its proper divisors (46314072).

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

20213928 is a wasteful number, since it uses less digits than its factorization.

20213928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20213928 is about 4495.9902135125. The cubic root of 20213928 is about 272.4061478556.

The spelling of 20213928 in words is "twenty million, two hundred thirteen thousand, nine hundred twenty-eight".