20351097 has 36 divisors (see below), whose sum is σ = 32892132. Its totient is φ = 12052800.

The previous prime is 20351087. The next prime is 20351101. The reversal of 20351097 is 79015302.

It can be written as a sum of positive squares in 2 ways, for example, as 1245456 + 19105641 = 1116^2 + 4371^2 .

It is not a de Polignac number, because 20351097 - 2⁴ = 20351081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20351097.

It is not an unprimeable number, because it can be changed into a prime (20351017) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 112347 + ... + 112527.

Almost surely, 2^20351097 is an apocalyptic number.

It is an amenable number.

20351097 is a deficient number, since it is larger than the sum of its proper divisors (12541035).

20351097 is a wasteful number, since it uses less digits than its factorization.

20351097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 20351097 is about 4511.2190148562. The cubic root of 20351097 is about 273.0209298449.

Adding to 20351097 its reverse (79015302), we get a palindrome (99366399).

The spelling of 20351097 in words is "twenty million, three hundred fifty-one thousand, ninety-seven".