20549397 has 8 divisors (see below), whose sum is σ = 29890080. Its totient is φ = 12454160.

The previous prime is 20549381. The next prime is 20549407. The reversal of 20549397 is 79394502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20549397 - 2⁴ = 20549381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20549297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311322 + ... + 311387.

It is an arithmetic number, because the mean of its divisors is an integer number (3736260).

Almost surely, 2^20549397 is an apocalyptic number.

It is an amenable number.

20549397 is a deficient number, since it is larger than the sum of its proper divisors (9340683).

20549397 is a wasteful number, since it uses less digits than its factorization.

20549397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622723.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 20549397 is about 4533.1442730185. The cubic root of 20549397 is about 273.9048322415.

The spelling of 20549397 in words is "twenty million, five hundred forty-nine thousand, three hundred ninety-seven".