20743601 has 4 divisors (see below), whose sum is σ = 20754804. Its totient is φ = 20732400.

The previous prime is 20743589. The next prime is 20743603. The reversal of 20743601 is 10634702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18054001 + 2689600 = 4249^2 + 1640^2 .

It is a cyclic number.

It is not a de Polignac number, because 20743601 - 2⁶ = 20743537 is a prime.

It is a super-3 number, since 3×20743601³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20743603) 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, 2090 + ... + 6771.

It is an arithmetic number, because the mean of its divisors is an integer number (5188701).

Almost surely, 2^20743601 is an apocalyptic number.

It is an amenable number.

20743601 is a deficient number, since it is larger than the sum of its proper divisors (11203).

20743601 is an equidigital number, since it uses as much as digits as its factorization.

20743601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11202.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 20743601 is about 4554.5143539130. The cubic root of 20743601 is about 274.7649826805.

The spelling of 20743601 in words is "twenty million, seven hundred forty-three thousand, six hundred one".