20466831 has 32 divisors (see below), whose sum is σ = 34868736. Its totient is φ = 10368000.

The previous prime is 20466773. The next prime is 20466847. The reversal of 20466831 is 13866402.

It is not a de Polignac number, because 20466831 - 2⁹ = 20466319 is a prime.

It is a super-2 number, since 2×20466831² = 837782342365122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20466881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8391 + ... + 10551.

It is an arithmetic number, because the mean of its divisors is an integer number (1089648).

Almost surely, 2^20466831 is an apocalyptic number.

20466831 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20466831 is a deficient number, since it is larger than the sum of its proper divisors (14401905).

20466831 is a wasteful number, since it uses less digits than its factorization.

20466831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2223.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20466831 is about 4524.0281829361. The cubic root of 20466831 is about 273.5374965162.

The spelling of 20466831 in words is "twenty million, four hundred sixty-six thousand, eight hundred thirty-one".