20512831 has 6 divisors (see below), whose sum is σ = 21245432. Its totient is φ = 19804680.

The previous prime is 20512771. The next prime is 20512841. The reversal of 20512831 is 13821502.

It is not a de Polignac number, because 20512831 - 2¹³ = 20504639 is a prime.

It is a super-2 number, since 2×20512831² = 841552471269122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20512841) 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 5 ways as a sum of consecutive naturals, for example, 11355 + ... + 13036.

Almost surely, 2^20512831 is an apocalyptic number.

20512831 is a deficient number, since it is larger than the sum of its proper divisors (732601).

20512831 is an equidigital number, since it uses as much as digits as its factorization.

20512831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24449 (or 24420 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 20512831 is about 4529.1092943315. The cubic root of 20512831 is about 273.7422719057.

The spelling of 20512831 in words is "twenty million, five hundred twelve thousand, eight hundred thirty-one".