20545745 has 16 divisors (see below), whose sum is σ = 28313280. Its totient is φ = 14155200.

The previous prime is 20545711. The next prime is 20545769. The reversal of 20545745 is 54754502.

It is not a de Polignac number, because 20545745 - 2¹⁶ = 20480209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8786 + ... + 10875.

It is an arithmetic number, because the mean of its divisors is an integer number (1769580).

Almost surely, 2^20545745 is an apocalyptic number.

It is an amenable number.

20545745 is a deficient number, since it is larger than the sum of its proper divisors (7767535).

20545745 is a wasteful number, since it uses less digits than its factorization.

20545745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19696.

The product of its (nonzero) digits is 28000, while the sum is 32.

The square root of 20545745 is about 4532.7414442035. The cubic root of 20545745 is about 273.8886053305. Note that the first 3 decimals are identical.

It can be divided in two parts, 205457 and 45, that added together give a palindrome (205502).

The spelling of 20545745 in words is "twenty million, five hundred forty-five thousand, seven hundred forty-five".