20743621 has 8 divisors (see below), whose sum is σ = 22071744. Its totient is φ = 19427520.

The previous prime is 20743603. The next prime is 20743627. The reversal of 20743621 is 12634702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20743621 - 2⁵ = 20743589 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 (20743627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696 + ... + 6478.

It is an arithmetic number, because the mean of its divisors is an integer number (2758968).

Almost surely, 2^20743621 is an apocalyptic number.

It is an amenable number.

20743621 is a deficient number, since it is larger than the sum of its proper divisors (1328123).

20743621 is a wasteful number, since it uses less digits than its factorization.

20743621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6011.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20743621 is about 4554.5165495363. The cubic root of 20743621 is about 274.7650709856.

The spelling of 20743621 in words is "twenty million, seven hundred forty-three thousand, six hundred twenty-one".