20970615 has 16 divisors (see below), whose sum is σ = 33698016. Its totient is φ = 11136000.

The previous prime is 20970589. The next prime is 20970617. The reversal of 20970615 is 51607902.

It is not a de Polignac number, because 20970615 - 2¹⁷ = 20839543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20970617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 715 + ... + 6515.

It is an arithmetic number, because the mean of its divisors is an integer number (2106126).

Almost surely, 2^20970615 is an apocalyptic number.

20970615 is a deficient number, since it is larger than the sum of its proper divisors (12727401).

20970615 is a wasteful number, since it uses less digits than its factorization.

20970615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6050.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 20970615 is about 4579.3684062325. The cubic root of 20970615 is about 275.7636734632.

The spelling of 20970615 in words is "twenty million, nine hundred seventy thousand, six hundred fifteen".