20799745 has 16 divisors (see below), whose sum is σ = 25850880. Its totient is φ = 16055424.

The previous prime is 20799743. The next prime is 20799763. The reversal of 20799745 is 54799702.

It is a cyclic number.

It is not a de Polignac number, because 20799745 - 2¹ = 20799743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (20799743) 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, 18592 + ... + 19678.

It is an arithmetic number, because the mean of its divisors is an integer number (1615680).

Almost surely, 2^20799745 is an apocalyptic number.

It is an amenable number.

20799745 is a deficient number, since it is larger than the sum of its proper divisors (5051135).

20799745 is a wasteful number, since it uses less digits than its factorization.

20799745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 20799745 is about 4560.6737440865. The cubic root of 20799745 is about 275.0126495559.

Subtracting from 20799745 its sum of digits (43), we obtain a palindrome (20799702).

The spelling of 20799745 in words is "twenty million, seven hundred ninety-nine thousand, seven hundred forty-five".