20517101 has 8 divisors (see below), whose sum is σ = 22425984. Its totient is φ = 18615520.

The previous prime is 20517067. The next prime is 20517109. The reversal of 20517101 is 10171502.

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

It is not a de Polignac number, because 20517101 - 2⁶ = 20517037 is a prime.

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 20517101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20517109) 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, 5276 + ... + 8298.

It is an arithmetic number, because the mean of its divisors is an integer number (2803248).

Almost surely, 2^20517101 is an apocalyptic number.

It is an amenable number.

20517101 is a deficient number, since it is larger than the sum of its proper divisors (1908883).

20517101 is a wasteful number, since it uses less digits than its factorization.

20517101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3651.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 20517101 is about 4529.5806649181. The cubic root of 20517101 is about 273.7612648701.

Adding to 20517101 its reverse (10171502), we get a palindrome (30688603).

The spelling of 20517101 in words is "twenty million, five hundred seventeen thousand, one hundred one".