20486643 has 12 divisors (see below), whose sum is σ = 27722520. Its totient is φ = 13455552.

The previous prime is 20486639. The next prime is 20486663. The reversal of 20486643 is 34668402.

It is not a de Polignac number, because 20486643 - 2² = 20486639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20486633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73821 + ... + 74097.

It is an arithmetic number, because the mean of its divisors is an integer number (2310210).

Almost surely, 2^20486643 is an apocalyptic number.

20486643 is a deficient number, since it is larger than the sum of its proper divisors (7235877).

20486643 is an frugal number, since it uses more digits than its factorization.

20486643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 369 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 20486643 is about 4526.2172948280. The cubic root of 20486643 is about 273.6257299637.

The spelling of 20486643 in words is "twenty million, four hundred eighty-six thousand, six hundred forty-three".