20745969 has 8 divisors (see below), whose sum is σ = 27720960. Its totient is φ = 13800816.

The previous prime is 20745911. The next prime is 20745971. The reversal of 20745969 is 96954702.

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

It is not a de Polignac number, because 20745969 - 2¹⁵ = 20713201 is a prime.

It is a super-2 number, since 2×20745969² = 860790459497922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 20745969.

It is not an unprimeable number, because it can be changed into a prime (20745869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5782 + ... + 8655.

It is an arithmetic number, because the mean of its divisors is an integer number (3465120).

Almost surely, 2^20745969 is an apocalyptic number.

It is an amenable number.

20745969 is a deficient number, since it is larger than the sum of its proper divisors (6974991).

20745969 is a wasteful number, since it uses less digits than its factorization.

20745969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14919.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 20745969 is about 4554.7743083494. The cubic root of 20745969 is about 274.7754376110.

The spelling of 20745969 in words is "twenty million, seven hundred forty-five thousand, nine hundred sixty-nine".