20217897 has 32 divisors (see below), whose sum is σ = 35727360. Its totient is φ = 11048400.

The previous prime is 20217839. The next prime is 20217931. The reversal of 20217897 is 79871202.

It is not a de Polignac number, because 20217897 - 2⁶ = 20217833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20217817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2022 + ... + 6672.

It is an arithmetic number, because the mean of its divisors is an integer number (1116480).

Almost surely, 2^20217897 is an apocalyptic number.

20217897 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20217897 is a deficient number, since it is larger than the sum of its proper divisors (15509463).

20217897 is a wasteful number, since it uses less digits than its factorization.

20217897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4690 (or 4684 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 20217897 is about 4496.4315851573. The cubic root of 20217897 is about 272.4239756498.

The spelling of 20217897 in words is "twenty million, two hundred seventeen thousand, eight hundred ninety-seven".