20885455 has 8 divisors (see below), whose sum is σ = 25087104. Its totient is φ = 16692000.

The previous prime is 20885453. The next prime is 20885471. The reversal of 20885455 is 55458802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20885455 - 2¹ = 20885453 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 (20885453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8685 + ... + 10825.

It is an arithmetic number, because the mean of its divisors is an integer number (3135888).

Almost surely, 2^20885455 is an apocalyptic number.

20885455 is a deficient number, since it is larger than the sum of its proper divisors (4201649).

20885455 is a wasteful number, since it uses less digits than its factorization.

20885455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097.

The product of its (nonzero) digits is 64000, while the sum is 37.

The square root of 20885455 is about 4570.0607216973. The cubic root of 20885455 is about 275.3898822435.

The spelling of 20885455 in words is "twenty million, eight hundred eighty-five thousand, four hundred fifty-five".