20984031 has 12 divisors (see below), whose sum is σ = 30357808. Its totient is φ = 13967424.

The previous prime is 20984021. The next prime is 20984039. The reversal of 20984031 is 13048902.

It is not a de Polignac number, because 20984031 - 2⁹ = 20983519 is a prime.

It is a super-2 number, since 2×20984031² = 880659114017922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20983986 and 20984004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20984039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5991 + ... + 8823.

Almost surely, 2^20984031 is an apocalyptic number.

20984031 is a deficient number, since it is larger than the sum of its proper divisors (9373777).

20984031 is a wasteful number, since it uses less digits than its factorization.

20984031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3662 (or 3659 counting only the distinct ones).

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

The square root of 20984031 is about 4580.8330028500. The cubic root of 20984031 is about 275.8224677455.

The spelling of 20984031 in words is "twenty million, nine hundred eighty-four thousand, thirty-one".