20699045 has 4 divisors (see below), whose sum is σ = 24838860. Its totient is φ = 16559232.

The previous prime is 20699033. The next prime is 20699051. The reversal of 20699045 is 54099602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54099602 = 2 ⋅27049801.

It can be written as a sum of positive squares in 2 ways, for example, as 9523396 + 11175649 = 3086^2 + 3343^2 .

It is a cyclic number.

It is not a de Polignac number, because 20699045 - 2⁶ = 20698981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20698996 and 20699014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2069900 + ... + 2069909.

It is an arithmetic number, because the mean of its divisors is an integer number (6209715).

Almost surely, 2^20699045 is an apocalyptic number.

It is an amenable number.

20699045 is a deficient number, since it is larger than the sum of its proper divisors (4139815).

20699045 is an equidigital number, since it uses as much as digits as its factorization.

20699045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4139814.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 20699045 is about 4549.6203138284. The cubic root of 20699045 is about 274.5681154735.

The spelling of 20699045 in words is "twenty million, six hundred ninety-nine thousand, forty-five".