20643801 has 8 divisors (see below), whose sum is σ = 27710400. Its totient is φ = 13669872.

The previous prime is 20643769. The next prime is 20643809. The reversal of 20643801 is 10834602.

It is a happy number.

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

It is not a de Polignac number, because 20643801 - 2⁵ = 20643769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20643809) 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, 22645 + ... + 23538.

It is an arithmetic number, because the mean of its divisors is an integer number (3463800).

Almost surely, 2^20643801 is an apocalyptic number.

It is an amenable number.

20643801 is a deficient number, since it is larger than the sum of its proper divisors (7066599).

20643801 is a wasteful number, since it uses less digits than its factorization.

20643801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46335.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20643801 is about 4543.5449816195. The cubic root of 20643801 is about 274.3236314846.

The spelling of 20643801 in words is "twenty million, six hundred forty-three thousand, eight hundred one".