20971197 has 16 divisors (see below), whose sum is σ = 33458880. Its totient is φ = 12905136.

The previous prime is 20971157. The next prime is 20971219. The reversal of 20971197 is 79117902.

It is not a de Polignac number, because 20971197 - 2¹¹ = 20969149 is a prime.

It is a super-2 number, since 2×20971197² = 879582207225618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20971127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29523 + ... + 30224.

It is an arithmetic number, because the mean of its divisors is an integer number (2091180).

Almost surely, 2^20971197 is an apocalyptic number.

20971197 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20971197 is a deficient number, since it is larger than the sum of its proper divisors (12487683).

20971197 is a wasteful number, since it uses less digits than its factorization.

20971197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59769 (or 59763 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 36.

The square root of 20971197 is about 4579.4319516726. The cubic root of 20971197 is about 275.7662245404.

The spelling of 20971197 in words is "twenty million, nine hundred seventy-one thousand, one hundred ninety-seven".