20696145 has 16 divisors (see below), whose sum is σ = 33581952. Its totient is φ = 10881920.

The previous prime is 20696119. The next prime is 20696147. The reversal of 20696145 is 54169602.

It is not a de Polignac number, because 20696145 - 2⁸ = 20695889 is a prime.

It is a super-2 number, since 2×20696145² = 856660835722050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20696147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8652 + ... + 10781.

It is an arithmetic number, because the mean of its divisors is an integer number (2098872).

Almost surely, 2^20696145 is an apocalyptic number.

It is an amenable number.

20696145 is a deficient number, since it is larger than the sum of its proper divisors (12885807).

20696145 is a wasteful number, since it uses less digits than its factorization.

20696145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19512.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20696145 is about 4549.3015947506. The cubic root of 20696145 is about 274.5552922616. Note that the first 3 decimals are identical.

The spelling of 20696145 in words is "twenty million, six hundred ninety-six thousand, one hundred forty-five".