20972017 has 12 divisors (see below), whose sum is σ = 23705136. Its totient is φ = 18399920.

The previous prime is 20971997. The next prime is 20972023. The reversal of 20972017 is 71027902.

It is a happy number.

It is not a de Polignac number, because 20972017 - 2⁷ = 20971889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20972087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8118 + ... + 10384.

It is an arithmetic number, because the mean of its divisors is an integer number (1975428).

Almost surely, 2^20972017 is an apocalyptic number.

It is an amenable number.

20972017 is a deficient number, since it is larger than the sum of its proper divisors (2733119).

20972017 is a wasteful number, since it uses less digits than its factorization.

20972017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2336 (or 2307 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 20972017 is about 4579.5214815524. The cubic root of 20972017 is about 275.7698187615.

Adding to 20972017 its reverse (71027902), we get a palindrome (91999919).

It can be divided in two parts, 2097 and 2017, that added together give a palindrome (4114).

The spelling of 20972017 in words is "twenty million, nine hundred seventy-two thousand, seventeen".