20917379 has 8 divisors (see below), whose sum is σ = 23992320. Its totient is φ = 17864136.

The previous prime is 20917367. The next prime is 20917409. The reversal of 20917379 is 97371902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20917379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20917349) 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, 3299 + ... + 7260.

It is an arithmetic number, because the mean of its divisors is an integer number (2999040).

Almost surely, 2^20917379 is an apocalyptic number.

20917379 is a deficient number, since it is larger than the sum of its proper divisors (3074941).

20917379 is a wasteful number, since it uses less digits than its factorization.

20917379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10849.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 20917379 is about 4573.5521206170. The cubic root of 20917379 is about 275.5301245162.

The spelling of 20917379 in words is "twenty million, nine hundred seventeen thousand, three hundred seventy-nine".