20745967 has 16 divisors (see below), whose sum is σ = 25228800. Its totient is φ = 16813440.

The previous prime is 20745911. The next prime is 20745971. The reversal of 20745967 is 76954702.

It is a cyclic number.

It is not a de Polignac number, because 20745967 - 2¹⁹ = 20221679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20745667) 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, 634 + ... + 6472.

It is an arithmetic number, because the mean of its divisors is an integer number (1576800).

Almost surely, 2^20745967 is an apocalyptic number.

20745967 is a deficient number, since it is larger than the sum of its proper divisors (4482833).

20745967 is a wasteful number, since it uses less digits than its factorization.

20745967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5886.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 20745967 is about 4554.7740887996. The cubic root of 20745967 is about 274.7754287812.

It can be divided in two parts, 20745 and 967, that added together give a palindrome (21712).

The spelling of 20745967 in words is "twenty million, seven hundred forty-five thousand, nine hundred sixty-seven".