20361243 has 16 divisors (see below), whose sum is σ = 31089920. Its totient is φ = 11611296.

The previous prime is 20361241. The next prime is 20361281. The reversal of 20361243 is 34216302.

It is a happy number.

It is not a de Polignac number, because 20361243 - 2¹ = 20361241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20361241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18513 + ... + 19581.

It is an arithmetic number, because the mean of its divisors is an integer number (1943120).

Almost surely, 2^20361243 is an apocalyptic number.

20361243 is a deficient number, since it is larger than the sum of its proper divisors (10728677).

20361243 is a wasteful number, since it uses less digits than its factorization.

20361243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20361243 is about 4512.3434044851. The cubic root of 20361243 is about 273.0662936590.

Adding to 20361243 its reverse (34216302), we get a palindrome (54577545).

The spelling of 20361243 in words is "twenty million, three hundred sixty-one thousand, two hundred forty-three".