20140645 has 16 divisors (see below), whose sum is σ = 28575360. Its totient is φ = 13333824.

The previous prime is 20140643. The next prime is 20140657. The reversal of 20140645 is 54604102.

It is not a de Polignac number, because 20140645 - 2¹ = 20140643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20140643) 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, 8907 + ... + 10936.

It is an arithmetic number, because the mean of its divisors is an integer number (1785960).

Almost surely, 2^20140645 is an apocalyptic number.

It is an amenable number.

20140645 is a deficient number, since it is larger than the sum of its proper divisors (8434715).

20140645 is a wasteful number, since it uses less digits than its factorization.

20140645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19884.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20140645 is about 4487.8329960015. The cubic root of 20140645 is about 272.0765580705.

Adding to 20140645 its reverse (54604102), we get a palindrome (74744747).

The spelling of 20140645 in words is "twenty million, one hundred forty thousand, six hundred forty-five".