20449890 has 48 divisors (see below), whose sum is σ = 55972800. Its totient is φ = 5165856.

The previous prime is 20449889. The next prime is 20449907. The reversal of 20449890 is 9894402.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4270 + ... + 7689.

It is an arithmetic number, because the mean of its divisors is an integer number (1166100).

Almost surely, 2^20449890 is an apocalyptic number.

20449890 is an abundant number, since it is smaller than the sum of its proper divisors (35522910).

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

20449890 is a wasteful number, since it uses less digits than its factorization.

20449890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11991 (or 11988 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20449890 is about 4522.1554595126. The cubic root of 20449890 is about 273.4620039972.

The spelling of 20449890 in words is "twenty million, four hundred forty-nine thousand, eight hundred ninety".