20100917 has 8 divisors (see below), whose sum is σ = 21398400. Its totient is φ = 18827424.

The previous prime is 20100911. The next prime is 20100931. The reversal of 20100917 is 71900102.

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 20100917 - 2⁶ = 20100853 is a prime.

It is a super-3 number, since 3×20100917³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100911) 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, 4253 + ... + 7634.

It is an arithmetic number, because the mean of its divisors is an integer number (2674800).

Almost surely, 2^20100917 is an apocalyptic number.

It is an amenable number.

20100917 is a deficient number, since it is larger than the sum of its proper divisors (1297483).

20100917 is a wasteful number, since it uses less digits than its factorization.

20100917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11995.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 20100917 is about 4483.4046214902. The cubic root of 20100917 is about 271.8975473792.

The spelling of 20100917 in words is "twenty million, one hundred thousand, nine hundred seventeen".