20233840 has 40 divisors (see below), whose sum is σ = 51322608. Its totient is φ = 7357440.

The previous prime is 20233831. The next prime is 20233847. The reversal of 20233840 is 4833202.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×20233840² = 818816562291200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20233847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10617 + ... + 12376.

Almost surely, 2^20233840 is an apocalyptic number.

20233840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20233840 is an abundant number, since it is smaller than the sum of its proper divisors (31088768).

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

20233840 is a wasteful number, since it uses less digits than its factorization.

20233840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23017 (or 23011 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20233840 is about 4498.2040860770. The cubic root of 20233840 is about 272.4955642742.

The spelling of 20233840 in words is "twenty million, two hundred thirty-three thousand, eight hundred forty".