20102697 has 12 divisors (see below), whose sum is σ = 29364660. Its totient is φ = 13250688.

The previous prime is 20102689. The next prime is 20102701. The reversal of 20102697 is 79620102.

It can be written as a sum of positive squares in 2 ways, for example, as 4822416 + 15280281 = 2196^2 + 3909^2 .

It is not a de Polignac number, because 20102697 - 2³ = 20102689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20102697.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11748 + ... + 13349.

It is an arithmetic number, because the mean of its divisors is an integer number (2447055).

Almost surely, 2^20102697 is an apocalyptic number.

It is an amenable number.

20102697 is a deficient number, since it is larger than the sum of its proper divisors (9261963).

20102697 is a wasteful number, since it uses less digits than its factorization.

20102697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25192 (or 25189 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20102697 is about 4483.6031269505. The cubic root of 20102697 is about 271.9055729392.

Adding to 20102697 its reverse (79620102), we get a palindrome (99722799).

The spelling of 20102697 in words is "twenty million, one hundred two thousand, six hundred ninety-seven".