20432243 has 4 divisors (see below), whose sum is σ = 22003968. Its totient is φ = 18860520.

The previous prime is 20432233. The next prime is 20432261. The reversal of 20432243 is 34223402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20432243 - 2⁸ = 20431987 is a prime.

It is a super-2 number, since 2×20432243² = 834953108022098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20432233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785843 + ... + 785868.

It is an arithmetic number, because the mean of its divisors is an integer number (5500992).

Almost surely, 2^20432243 is an apocalyptic number.

20432243 is a deficient number, since it is larger than the sum of its proper divisors (1571725).

20432243 is a wasteful number, since it uses less digits than its factorization.

20432243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571724.

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 20432243 is about 4520.2038670839. The cubic root of 20432243 is about 273.3833210513.

Adding to 20432243 its reverse (34223402), we get a palindrome (54655645).

The spelling of 20432243 in words is "twenty million, four hundred thirty-two thousand, two hundred forty-three".