20491359 has 12 divisors (see below), whose sum is σ = 31782744. Its totient is φ = 11709264.

The previous prime is 20491351. The next prime is 20491369. The reversal of 20491359 is 95319402.

It is not a de Polignac number, because 20491359 - 2³ = 20491351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20491351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69552 + ... + 69845.

It is an arithmetic number, because the mean of its divisors is an integer number (2648562).

Almost surely, 2^20491359 is an apocalyptic number.

20491359 is a deficient number, since it is larger than the sum of its proper divisors (11291385).

20491359 is a wasteful number, since it uses less digits than its factorization.

20491359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139414 (or 139407 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 20491359 is about 4526.7382296749. The cubic root of 20491359 is about 273.6467244549.

The spelling of 20491359 in words is "twenty million, four hundred ninety-one thousand, three hundred fifty-nine".