20495808 has 112 divisors (see below), whose sum is σ = 62484000. Its totient is φ = 6580224.

The previous prime is 20495803. The next prime is 20495819. The reversal of 20495808 is 80859402.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20495801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49908 + ... + 50316.

Almost surely, 2^20495808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20495808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31242000).

20495808 is an abundant number, since it is smaller than the sum of its proper divisors (41988192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20495808 is a wasteful number, since it uses less digits than its factorization.

20495808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 20495808 is about 4527.2296164432. The cubic root of 20495808 is about 273.6665273740. Note that the first 3 decimals are identical.

The spelling of 20495808 in words is "twenty million, four hundred ninety-five thousand, eight hundred eight".