20972835 has 24 divisors (see below), whose sum is σ = 39150384. Its totient is φ = 10324800.

The previous prime is 20972813. The next prime is 20972839. The reversal of 20972835 is 53827902.

It is a happy number.

It is not a de Polignac number, because 20972835 - 2⁸ = 20972579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20972835.

It is not an unprimeable number, because it can be changed into a prime (20972839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17341 + ... + 18510.

It is an arithmetic number, because the mean of its divisors is an integer number (1631266).

Almost surely, 2^20972835 is an apocalyptic number.

20972835 is a deficient number, since it is larger than the sum of its proper divisors (18177549).

20972835 is a wasteful number, since it uses less digits than its factorization.

20972835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35875 (or 35872 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 20972835 is about 4579.6107913228. The cubic root of 20972835 is about 275.7734041229.

The spelling of 20972835 in words is "twenty million, nine hundred seventy-two thousand, eight hundred thirty-five".