20941517 has 4 divisors (see below), whose sum is σ = 21003996. Its totient is φ = 20879040.

The previous prime is 20941511. The next prime is 20941537. The reversal of 20941517 is 71514902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71514902 = 2 ⋅35757451.

It can be written as a sum of positive squares in 2 ways, for example, as 12292036 + 8649481 = 3506^2 + 2941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20941517 is a prime.

It is a super-2 number, since 2×20941517² = 877094268522578, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20941517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20941511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30734 + ... + 31407.

It is an arithmetic number, because the mean of its divisors is an integer number (5250999).

Almost surely, 2^20941517 is an apocalyptic number.

It is an amenable number.

20941517 is a deficient number, since it is larger than the sum of its proper divisors (62479).

20941517 is an equidigital number, since it uses as much as digits as its factorization.

20941517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62478.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 20941517 is about 4576.1902276894. The cubic root of 20941517 is about 275.6360681518.

The spelling of 20941517 in words is "twenty million, nine hundred forty-one thousand, five hundred seventeen".