20491828 has 12 divisors (see below), whose sum is σ = 40983712. Its totient is φ = 8782200.

The previous prime is 20491811. The next prime is 20491829. The reversal of 20491828 is 82819402.

20491828 is an admirable number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20491793 and 20491802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20491829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365898 + ... + 365953.

Almost surely, 2^20491828 is an apocalyptic number.

20491828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20491828 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20491828 is a wasteful number, since it uses less digits than its factorization.

20491828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731862 (or 731860 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 20491828 is about 4526.7900326832. The cubic root of 20491828 is about 273.6488121533.

The spelling of 20491828 in words is "twenty million, four hundred ninety-one thousand, eight hundred twenty-eight".