20744395 has 24 divisors (see below), whose sum is σ = 29163024. Its totient is φ = 14124096.

The previous prime is 20744393. The next prime is 20744407. The reversal of 20744395 is 59344702.

It is not a de Polignac number, because 20744395 - 2¹ = 20744393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20744395.

It is not an unprimeable number, because it can be changed into a prime (20744393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55429 + ... + 55801.

It is an arithmetic number, because the mean of its divisors is an integer number (1215126).

Almost surely, 2^20744395 is an apocalyptic number.

20744395 is a deficient number, since it is larger than the sum of its proper divisors (8418629).

20744395 is a wasteful number, since it uses less digits than its factorization.

20744395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20744395 is about 4554.6015193428. The cubic root of 20744395 is about 274.7684883498.

The spelling of 20744395 in words is "twenty million, seven hundred forty-four thousand, three hundred ninety-five".