20911485 has 48 divisors (see below), whose sum is σ = 40646016. Its totient is φ = 9136512.

The previous prime is 20911481. The next prime is 20911487. The reversal of 20911485 is 58411902.

It is a happy number.

It is not a de Polignac number, because 20911485 - 2² = 20911481 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20911481) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16287 + ... + 17523.

It is an arithmetic number, because the mean of its divisors is an integer number (846792).

Almost surely, 2^20911485 is an apocalyptic number.

It is an amenable number.

20911485 is a deficient number, since it is larger than the sum of its proper divisors (19734531).

20911485 is a wasteful number, since it uses less digits than its factorization.

20911485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282 (or 1275 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 20911485 is about 4572.9077182904. The cubic root of 20911485 is about 275.5042428939.

The spelling of 20911485 in words is "twenty million, nine hundred eleven thousand, four hundred eighty-five".