20756145 has 8 divisors (see below), whose sum is σ = 33209856. Its totient is φ = 11069936.

The previous prime is 20756137. The next prime is 20756159. The reversal of 20756145 is 54165702.

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

It is a cyclic number.

It is not a de Polignac number, because 20756145 - 2³ = 20756137 is a prime.

It is a super-2 number, since 2×20756145² = 861635110522050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691857 + ... + 691886.

It is an arithmetic number, because the mean of its divisors is an integer number (4151232).

Almost surely, 2^20756145 is an apocalyptic number.

It is an amenable number.

20756145 is a deficient number, since it is larger than the sum of its proper divisors (12453711).

20756145 is a wasteful number, since it uses less digits than its factorization.

20756145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383751.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 20756145 is about 4555.8912410197. The cubic root of 20756145 is about 274.8203565028.

The spelling of 20756145 in words is "twenty million, seven hundred fifty-six thousand, one hundred forty-five".