20971035 has 32 divisors (see below), whose sum is σ = 38492160. Its totient is φ = 10821600.

The previous prime is 20971021. The next prime is 20971039. The reversal of 20971035 is 53017902.

It is not a de Polignac number, because 20971035 - 2¹⁰ = 20970011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20971039) 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, 1680 + ... + 6690.

It is an arithmetic number, because the mean of its divisors is an integer number (1202880).

Almost surely, 2^20971035 is an apocalyptic number.

20971035 is a deficient number, since it is larger than the sum of its proper divisors (17521125).

20971035 is a wasteful number, since it uses less digits than its factorization.

20971035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5056 (or 5050 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 20971035 is about 4579.4142638551. The cubic root of 20971035 is about 275.7655144515.

Adding to 20971035 its reverse (53017902), we get a palindrome (73988937).

The spelling of 20971035 in words is "twenty million, nine hundred seventy-one thousand, thirty-five".