20696491 has 6 divisors (see below), whose sum is σ = 21843492. Its totient is φ = 19606860.

The previous prime is 20696483. The next prime is 20696503. The reversal of 20696491 is 19469602.

It is not a de Polignac number, because 20696491 - 2³ = 20696483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20696491.

It is not an unprimeable number, because it can be changed into a prime (20696411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28305 + ... + 29026.

It is an arithmetic number, because the mean of its divisors is an integer number (3640582).

Almost surely, 2^20696491 is an apocalyptic number.

20696491 is a deficient number, since it is larger than the sum of its proper divisors (1147001).

20696491 is an equidigital number, since it uses as much as digits as its factorization.

20696491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57369 (or 57350 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20696491 is about 4549.3396224068. The cubic root of 20696491 is about 274.5568222663.

The spelling of 20696491 in words is "twenty million, six hundred ninety-six thousand, four hundred ninety-one".