20650031 has 4 divisors (see below), whose sum is σ = 20754000. Its totient is φ = 20546064.

The previous prime is 20650027. The next prime is 20650043. The reversal of 20650031 is 13005602.

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 20650031 - 2² = 20650027 is a prime.

It is a super-2 number, since 2×20650031² = 852847560601922, 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 = 20649991 and 20650009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20650081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51686 + ... + 52083.

It is an arithmetic number, because the mean of its divisors is an integer number (5188500).

Almost surely, 2^20650031 is an apocalyptic number.

20650031 is a deficient number, since it is larger than the sum of its proper divisors (103969).

20650031 is a wasteful number, since it uses less digits than its factorization.

20650031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103968.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 20650031 is about 4544.2305179205. The cubic root of 20650031 is about 274.3512243414.

Adding to 20650031 its reverse (13005602), we get a palindrome (33655633).

The spelling of 20650031 in words is "twenty million, six hundred fifty thousand, thirty-one".