20213917 has 8 divisors (see below), whose sum is σ = 20465280. Its totient is φ = 19964400.

The previous prime is 20213887. The next prime is 20213923. The reversal of 20213917 is 71931202.

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 20213917 - 2¹⁵ = 20181149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20213891 and 20213900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213317) 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, 39459 + ... + 39967.

It is an arithmetic number, because the mean of its divisors is an integer number (2558160).

Almost surely, 2^20213917 is an apocalyptic number.

It is an amenable number.

20213917 is a deficient number, since it is larger than the sum of its proper divisors (251363).

20213917 is a wasteful number, since it uses less digits than its factorization.

20213917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 20213917 is about 4495.9889902000. The cubic root of 20213917 is about 272.4060984430.

The spelling of 20213917 in words is "twenty million, two hundred thirteen thousand, nine hundred seventeen".