20986485 has 32 divisors (see below), whose sum is σ = 36384768. Its totient is φ = 10268160.

The previous prime is 20986481. The next prime is 20986519. The reversal of 20986485 is 58468902.

It is not a de Polignac number, because 20986485 - 2² = 20986481 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20986481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54604 + ... + 54986.

It is an arithmetic number, because the mean of its divisors is an integer number (1137024).

Almost surely, 2^20986485 is an apocalyptic number.

It is an amenable number.

20986485 is a deficient number, since it is larger than the sum of its proper divisors (15398283).

20986485 is a wasteful number, since it uses less digits than its factorization.

20986485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 20986485 is about 4581.1008502324. The cubic root of 20986485 is about 275.8332194444.

The spelling of 20986485 in words is "twenty million, nine hundred eighty-six thousand, four hundred eighty-five".