20696391 has 10 divisors (see below), whose sum is σ = 30916952. Its totient is φ = 13797540.

The previous prime is 20696387. The next prime is 20696399. The reversal of 20696391 is 19369602.

It is not a de Polignac number, because 20696391 - 2² = 20696387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20696399) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 127675 + ... + 127836.

Almost surely, 2^20696391 is an apocalyptic number.

20696391 is a deficient number, since it is larger than the sum of its proper divisors (10220561).

20696391 is an equidigital number, since it uses as much as digits as its factorization.

20696391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255523 (or 255514 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 20696391 is about 4549.3286317873. The cubic root of 20696391 is about 274.5563800702.

The spelling of 20696391 in words is "twenty million, six hundred ninety-six thousand, three hundred ninety-one".