20897045 has 16 divisors (see below), whose sum is σ = 27738480. Its totient is φ = 15012864.

The previous prime is 20897039. The next prime is 20897047. The reversal of 20897045 is 54079802.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 763876 + 20133169 = 874^2 + 4487^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20897045 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20896996 and 20897014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20897047) 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, 1940 + ... + 6749.

It is an arithmetic number, because the mean of its divisors is an integer number (1733655).

Almost surely, 2^20897045 is an apocalyptic number.

It is an amenable number.

20897045 is a deficient number, since it is larger than the sum of its proper divisors (6841435).

20897045 is a wasteful number, since it uses less digits than its factorization.

20897045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8744.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20897045 is about 4571.3285814958. The cubic root of 20897045 is about 275.4408136774.

The spelling of 20897045 in words is "twenty million, eight hundred ninety-seven thousand, forty-five".