20950917 has 16 divisors (see below), whose sum is σ = 30898560. Its totient is φ = 12543552.

The previous prime is 20950913. The next prime is 20950997. The reversal of 20950917 is 71905902.

It is not a de Polignac number, because 20950917 - 2² = 20950913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20950913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5817 + ... + 8702.

It is an arithmetic number, because the mean of its divisors is an integer number (1931160).

Almost surely, 2^20950917 is an apocalyptic number.

It is an amenable number.

20950917 is a deficient number, since it is larger than the sum of its proper divisors (9947643).

20950917 is a wasteful number, since it uses less digits than its factorization.

20950917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14572.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 20950917 is about 4577.2171676686. The cubic root of 20950917 is about 275.6773034877.

It can be divided in two parts, 209509 and 17, that multiplied together give a palindrome (3561653).

The spelling of 20950917 in words is "twenty million, nine hundred fifty thousand, nine hundred seventeen".