20243493 has 16 divisors (see below), whose sum is σ = 31569600. Its totient is φ = 12785040.

The previous prime is 20243471. The next prime is 20243501. The reversal of 20243493 is 39434202.

It is a happy number.

It is not a de Polignac number, because 20243493 - 2²⁴ = 3466277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20243593) 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 15 ways as a sum of consecutive naturals, for example, 19218 + ... + 20243.

It is an arithmetic number, because the mean of its divisors is an integer number (1973100).

Almost surely, 2^20243493 is an apocalyptic number.

It is an amenable number.

20243493 is a deficient number, since it is larger than the sum of its proper divisors (11326107).

20243493 is a wasteful number, since it uses less digits than its factorization.

20243493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39489 (or 39483 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 20243493 is about 4499.2769419097. The cubic root of 20243493 is about 272.5388907263.

Adding to 20243493 its reverse (39434202), we get a palindrome (59677695).

It can be divided in two parts, 20243 and 493, that multiplied together give a palindrome (9979799).

The spelling of 20243493 in words is "twenty million, two hundred forty-three thousand, four hundred ninety-three".