20901197 has 4 divisors (see below), whose sum is σ = 22001280. Its totient is φ = 19801116.

The previous prime is 20901191. The next prime is 20901217. The reversal of 20901197 is 79110902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20901197 - 2¹⁴ = 20884813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20901191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550013 + ... + 550050.

It is an arithmetic number, because the mean of its divisors is an integer number (5500320).

Almost surely, 2^20901197 is an apocalyptic number.

It is an amenable number.

20901197 is a deficient number, since it is larger than the sum of its proper divisors (1100083).

20901197 is a wasteful number, since it uses less digits than its factorization.

20901197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100082.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 20901197 is about 4571.7826938734. The cubic root of 20901197 is about 275.4590547657.

The spelling of 20901197 in words is "twenty million, nine hundred one thousand, one hundred ninety-seven".