20831049 has 24 divisors (see below), whose sum is σ = 32420960. Its totient is φ = 12845952.

The previous prime is 20831017. The next prime is 20831051. The reversal of 20831049 is 94013802.

It is not a de Polignac number, because 20831049 - 2⁵ = 20831017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20831009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5937 + ... + 8769.

Almost surely, 2^20831049 is an apocalyptic number.

It is an amenable number.

20831049 is a deficient number, since it is larger than the sum of its proper divisors (11589911).

20831049 is a wasteful number, since it uses less digits than its factorization.

20831049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901 (or 2898 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20831049 is about 4564.1044028374. The cubic root of 20831049 is about 275.1505467703.

The spelling of 20831049 in words is "twenty million, eight hundred thirty-one thousand, forty-nine".