20671642 has 8 divisors (see below), whose sum is σ = 31093056. Its totient is φ = 10307292.

The previous prime is 20671631. The next prime is 20671649. The reversal of 20671642 is 24617602.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20671642.

It is not an unprimeable number, because it can be changed into a prime (20671649) 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, 13348 + ... + 14815.

It is an arithmetic number, because the mean of its divisors is an integer number (3886632).

Almost surely, 2^20671642 is an apocalyptic number.

20671642 is a deficient number, since it is larger than the sum of its proper divisors (10421414).

20671642 is a wasteful number, since it uses less digits than its factorization.

20671642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28532.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20671642 is about 4546.6077464413. The cubic root of 20671642 is about 274.4468971147.

The spelling of 20671642 in words is "twenty million, six hundred seventy-one thousand, six hundred forty-two".