20449902 has 32 divisors (see below), whose sum is σ = 44789760. Its totient is φ = 6173120.

The previous prime is 20449889. The next prime is 20449907. The reversal of 20449902 is 20994402.

It is a self number, because there is not a number n which added to its sum of digits gives 20449902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20449907) 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 15 ways as a sum of consecutive naturals, for example, 24874 + ... + 25682.

It is an arithmetic number, because the mean of its divisors is an integer number (1399680).

Almost surely, 2^20449902 is an apocalyptic number.

20449902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20449902 is an abundant number, since it is smaller than the sum of its proper divisors (24339858).

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

20449902 is a wasteful number, since it uses less digits than its factorization.

20449902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20449902 is about 4522.1567863134. The cubic root of 20449902 is about 273.4620574864.

The spelling of 20449902 in words is "twenty million, four hundred forty-nine thousand, nine hundred two".