20465643 has 8 divisors (see below), whose sum is σ = 29768256. Its totient is φ = 12403400.

The previous prime is 20465609. The next prime is 20465647. The reversal of 20465643 is 34656402.

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 20465643 - 2⁹ = 20465131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20465643.

It is not an unprimeable number, because it can be changed into a prime (20465647) 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, 310053 + ... + 310118.

It is an arithmetic number, because the mean of its divisors is an integer number (3721032).

Almost surely, 2^20465643 is an apocalyptic number.

20465643 is a deficient number, since it is larger than the sum of its proper divisors (9302613).

20465643 is a wasteful number, since it uses less digits than its factorization.

20465643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620185.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 20465643 is about 4523.8968821139. The cubic root of 20465643 is about 273.5322039067.

The spelling of 20465643 in words is "twenty million, four hundred sixty-five thousand, six hundred forty-three".