20239912 has 96 divisors (see below), whose sum is σ = 49795200. Its totient is φ = 7539840.

The previous prime is 20239897. The next prime is 20239913. The reversal of 20239912 is 21993202.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (20239913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196453 + ... + 196555.

It is an arithmetic number, because the mean of its divisors is an integer number (518700).

Almost surely, 2^20239912 is an apocalyptic number.

20239912 is a gapful number since it is divisible by the number (22) 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 20239912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24897600).

20239912 is an abundant number, since it is smaller than the sum of its proper divisors (29555288).

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

20239912 is a wasteful number, since it uses less digits than its factorization.

20239912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20239912 is about 4498.8789714772. The cubic root of 20239912 is about 272.5228194004.

It can be divided in two parts, 2023 and 9912, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 20239912 in words is "twenty million, two hundred thirty-nine thousand, nine hundred twelve".