20927928 has 64 divisors (see below), whose sum is σ = 61205760. Its totient is φ = 5838336.

The previous prime is 20927927. The next prime is 20927947. The reversal of 20927928 is 82972902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20927923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5776 + ... + 8672.

It is an arithmetic number, because the mean of its divisors is an integer number (956340).

Almost surely, 2^20927928 is an apocalyptic number.

20927928 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 20927928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30602880).

20927928 is an abundant number, since it is smaller than the sum of its proper divisors (40277832).

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

20927928 is a wasteful number, since it uses less digits than its factorization.

20927928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2956 (or 2952 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20927928 is about 4574.7052364059. The cubic root of 20927928 is about 275.5764349520.

The spelling of 20927928 in words is "twenty million, nine hundred twenty-seven thousand, nine hundred twenty-eight".