20906541 has 6 divisors (see below), whose sum is σ = 30198350. Its totient is φ = 13937688.

The previous prime is 20906533. The next prime is 20906569. The reversal of 20906541 is 14560902.

20906541 is a `hidden beast` number, since 2 + 0 + 9 + 0 + 654 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20520900 + 385641 = 4530^2 + 621^2 .

It is not a de Polignac number, because 20906541 - 2³ = 20906533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20906521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1161466 + ... + 1161483.

Almost surely, 2^20906541 is an apocalyptic number.

It is an amenable number.

20906541 is a deficient number, since it is larger than the sum of its proper divisors (9291809).

20906541 is a wasteful number, since it uses less digits than its factorization.

20906541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322955 (or 2322952 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20906541 is about 4572.3671112456. The cubic root of 20906541 is about 275.4825291429.

The spelling of 20906541 in words is "twenty million, nine hundred six thousand, five hundred forty-one".