20217097 has 8 divisors (see below), whose sum is σ = 21862656. Its totient is φ = 18622272.

The previous prime is 20217077. The next prime is 20217101. The reversal of 20217097 is 79071202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20217097 - 2²³ = 11828489 is a prime.

It is a super-2 number, since 2×20217097² = 817462022214818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20217077) 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, 11853 + ... + 13450.

It is an arithmetic number, because the mean of its divisors is an integer number (2732832).

Almost surely, 2^20217097 is an apocalyptic number.

It is an amenable number.

20217097 is a deficient number, since it is larger than the sum of its proper divisors (1645559).

20217097 is a wasteful number, since it uses less digits than its factorization.

20217097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25367.

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

The square root of 20217097 is about 4496.3426248452. The cubic root of 20217097 is about 272.4203824298.

Adding to 20217097 its reverse (79071202), we get a palindrome (99288299).

The spelling of 20217097 in words is "twenty million, two hundred seventeen thousand, ninety-seven".