20731007 has 16 divisors (see below), whose sum is σ = 24364800. Its totient is φ = 17427840.

The previous prime is 20731001. The next prime is 20731043. The reversal of 20731007 is 70013702.

It is a cyclic number.

It is not a de Polignac number, because 20731007 - 2⁴ = 20730991 is a prime.

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 20731007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10094 + ... + 11972.

It is an arithmetic number, because the mean of its divisors is an integer number (1522800).

Almost surely, 2^20731007 is an apocalyptic number.

20731007 is a deficient number, since it is larger than the sum of its proper divisors (3633793).

20731007 is a wasteful number, since it uses less digits than its factorization.

20731007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966.

The product of its (nonzero) digits is 294, while the sum is 20.

The square root of 20731007 is about 4553.1315597070. The cubic root of 20731007 is about 274.7093656780.

Adding to 20731007 its reverse (70013702), we get a palindrome (90744709).

The spelling of 20731007 in words is "twenty million, seven hundred thirty-one thousand, seven".