20355667 has 8 divisors (see below), whose sum is σ = 21498624. Its totient is φ = 19234248.

The previous prime is 20355637. The next prime is 20355689. The reversal of 20355667 is 76655302.

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 20355667 - 2¹⁹ = 19831379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20355607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3423 + ... + 7240.

It is an arithmetic number, because the mean of its divisors is an integer number (2687328).

Almost surely, 2^20355667 is an apocalyptic number.

20355667 is a deficient number, since it is larger than the sum of its proper divisors (1142957).

20355667 is a wasteful number, since it uses less digits than its factorization.

20355667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10769.

The product of its (nonzero) digits is 37800, while the sum is 34.

The square root of 20355667 is about 4511.7255014019. The cubic root of 20355667 is about 273.0413646526.

The spelling of 20355667 in words is "twenty million, three hundred fifty-five thousand, six hundred sixty-seven".