20775545 has 8 divisors (see below), whose sum is σ = 28492224. Its totient is φ = 14246064.

The previous prime is 20775541. The next prime is 20775577. The reversal of 20775545 is 54557702.

It is a happy number.

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

It is not a de Polignac number, because 20775545 - 2² = 20775541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 593587 = 20775545 / (2 + 0 + 7 + 7 + 5 + 5 + 4 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20775541) 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, 296759 + ... + 296828.

It is an arithmetic number, because the mean of its divisors is an integer number (3561528).

Almost surely, 2^20775545 is an apocalyptic number.

It is an amenable number.

20775545 is a deficient number, since it is larger than the sum of its proper divisors (7716679).

20775545 is an equidigital number, since it uses as much as digits as its factorization.

20775545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593599.

The product of its (nonzero) digits is 49000, while the sum is 35.

The square root of 20775545 is about 4558.0198551564. The cubic root of 20775545 is about 274.9059513105.

The spelling of 20775545 in words is "twenty million, seven hundred seventy-five thousand, five hundred forty-five".