20606831 has 4 divisors (see below), whose sum is σ = 23550672. Its totient is φ = 17662992.

The previous prime is 20606813. The next prime is 20606857. The reversal of 20606831 is 13860602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20606831 - 2⁶ = 20606767 is a prime.

It is a super-2 number, since 2×20606831² = 849282967725122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20606831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20606801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1471910 + ... + 1471923.

It is an arithmetic number, because the mean of its divisors is an integer number (5887668).

Almost surely, 2^20606831 is an apocalyptic number.

20606831 is a deficient number, since it is larger than the sum of its proper divisors (2943841).

20606831 is an equidigital number, since it uses as much as digits as its factorization.

20606831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943840.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20606831 is about 4539.4747493515. The cubic root of 20606831 is about 274.1597759232.

The spelling of 20606831 in words is "twenty million, six hundred six thousand, eight hundred thirty-one".