20971093 has 16 divisors (see below), whose sum is σ = 25111296. Its totient is φ = 17259840.

The previous prime is 20971063. The next prime is 20971121. The reversal of 20971093 is 39017902.

It is a de Polignac number, because none of the positive numbers 2^k-20971093 is a prime.

It is a super-2 number, since 2×20971093² = 879573483229298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20971043) 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, 6196 + ... + 8962.

It is an arithmetic number, because the mean of its divisors is an integer number (1569456).

Almost surely, 2^20971093 is an apocalyptic number.

It is an amenable number.

20971093 is a deficient number, since it is larger than the sum of its proper divisors (4140203).

20971093 is a wasteful number, since it uses less digits than its factorization.

20971093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2844.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 20971093 is about 4579.4205965384. The cubic root of 20971093 is about 275.7657686813.

Adding to 20971093 its reverse (39017902), we get a palindrome (59988995).

The spelling of 20971093 in words is "twenty million, nine hundred seventy-one thousand, ninety-three".