20651361 has 8 divisors (see below), whose sum is σ = 27659520. Its totient is φ = 13705392.

The previous prime is 20651353. The next prime is 20651381. The reversal of 20651361 is 16315602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20651361 - 2³ = 20651353 is a prime.

It is a super-2 number, since 2×20651361² = 852957422304642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20651341) 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 7 ways as a sum of consecutive naturals, for example, 14766 + ... + 16103.

It is an arithmetic number, because the mean of its divisors is an integer number (3457440).

Almost surely, 2^20651361 is an apocalyptic number.

It is an amenable number.

20651361 is a deficient number, since it is larger than the sum of its proper divisors (7008159).

20651361 is a wasteful number, since it uses less digits than its factorization.

20651361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31095.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20651361 is about 4544.3768549714. The cubic root of 20651361 is about 274.3571142324.

Adding to 20651361 its reverse (16315602), we get a palindrome (36966963).

It can be divided in two parts, 20651 and 361, that added together give a palindrome (21012).

The spelling of 20651361 in words is "twenty million, six hundred fifty-one thousand, three hundred sixty-one".