20423928 has 32 divisors (see below), whose sum is σ = 58354560. Its totient is φ = 5835360.

The previous prime is 20423927. The next prime is 20423929. The reversal of 20423928 is 82932402.

It is an interprime number because it is at equal distance from previous prime (20423927) and next prime (20423929).

It is a junction number, because it is equal to n+sod(n) for n = 20423895 and 20423904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423927) 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, 60618 + ... + 60953.

It is an arithmetic number, because the mean of its divisors is an integer number (1823580).

Almost surely, 2^20423928 is an apocalyptic number.

20423928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20423928 is an abundant number, since it is smaller than the sum of its proper divisors (37930632).

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

20423928 is a wasteful number, since it uses less digits than its factorization.

20423928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121587 (or 121583 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20423928 is about 4519.2840140890. The cubic root of 20423928 is about 273.3462311317.

The spelling of 20423928 in words is "twenty million, four hundred twenty-three thousand, nine hundred twenty-eight".