20869743 has 4 divisors (see below), whose sum is σ = 27826328. Its totient is φ = 13913160.

The previous prime is 20869721. The next prime is 20869781. The reversal of 20869743 is 34796802.

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

It is not a de Polignac number, because 20869743 - 2⁵ = 20869711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20864743) 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, 3478288 + ... + 3478293.

It is an arithmetic number, because the mean of its divisors is an integer number (6956582).

Almost surely, 2^20869743 is an apocalyptic number.

20869743 is a deficient number, since it is larger than the sum of its proper divisors (6956585).

20869743 is an equidigital number, since it uses as much as digits as its factorization.

20869743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6956584.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 20869743 is about 4568.3413839160. The cubic root of 20869743 is about 275.3208068779.

It can be divided in two parts, 20869 and 743, that added together give a palindrome (21612).

The spelling of 20869743 in words is "twenty million, eight hundred sixty-nine thousand, seven hundred forty-three".