20143445 has 16 divisors (see below), whose sum is σ = 28149120. Its totient is φ = 13550784.

The previous prime is 20143441. The next prime is 20143451. The reversal of 20143445 is 54434102.

It is a cyclic number.

It is not a de Polignac number, because 20143445 - 2² = 20143441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20143445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143441) 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, 3575 + ... + 7284.

It is an arithmetic number, because the mean of its divisors is an integer number (1759320).

Almost surely, 2^20143445 is an apocalyptic number.

It is an amenable number.

20143445 is a deficient number, since it is larger than the sum of its proper divisors (8005675).

20143445 is a wasteful number, since it uses less digits than its factorization.

20143445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10924.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 20143445 is about 4488.1449397273. The cubic root of 20143445 is about 272.0891657280.

Adding to 20143445 its reverse (54434102), we get a palindrome (74577547).

The spelling of 20143445 in words is "twenty million, one hundred forty-three thousand, four hundred forty-five".