20889775 has 6 divisors (see below), whose sum is σ = 25903352. Its totient is φ = 16711800.

The previous prime is 20889763. The next prime is 20889779. The reversal of 20889775 is 57798802.

It is not a de Polignac number, because 20889775 - 2¹⁵ = 20857007 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 (20889779) 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, 417771 + ... + 417820.

Almost surely, 2^20889775 is an apocalyptic number.

20889775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20889775 is a deficient number, since it is larger than the sum of its proper divisors (5013577).

20889775 is an equidigital number, since it uses as much as digits as its factorization.

20889775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835601 (or 835596 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 20889775 is about 4570.5333386816. The cubic root of 20889775 is about 275.4088683796.

The spelling of 20889775 in words is "twenty million, eight hundred eighty-nine thousand, seven hundred seventy-five".