20491849 has 8 divisors (see below), whose sum is σ = 23897600. Its totient is φ = 17564148.

The previous prime is 20491847. The next prime is 20491853. The reversal of 20491849 is 94819402.

It is a happy number.

It is not a de Polignac number, because 20491849 - 2¹ = 20491847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20491843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29529 + ... + 30214.

It is an arithmetic number, because the mean of its divisors is an integer number (2987200).

Almost surely, 2^20491849 is an apocalyptic number.

It is an amenable number.

20491849 is a deficient number, since it is larger than the sum of its proper divisors (3405751).

20491849 is an frugal number, since it uses more digits than its factorization.

20491849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59764 (or 59750 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 20491849 is about 4526.7923522070. The cubic root of 20491849 is about 273.6489056316.

The spelling of 20491849 in words is "twenty million, four hundred ninety-one thousand, eight hundred forty-nine".