20870541 has 18 divisors (see below), whose sum is σ = 31314062. Its totient is φ = 13909320.

The previous prime is 20870513. The next prime is 20870573. The reversal of 20870541 is 14507802.

It can be written as a sum of positive squares in only one way, i.e., 13286025 + 7584516 = 3645^2 + 2754^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20870541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20870501) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4971 + ... + 8151.

Almost surely, 2^20870541 is an apocalyptic number.

It is an amenable number.

20870541 is a deficient number, since it is larger than the sum of its proper divisors (10443521).

20870541 is an frugal number, since it uses more digits than its factorization.

20870541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3205 (or 3184 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20870541 is about 4568.4287233140. The cubic root of 20870541 is about 275.3243159964.

The spelling of 20870541 in words is "twenty million, eight hundred seventy thousand, five hundred forty-one".