20197550 has 12 divisors (see below), whose sum is σ = 37567536. Its totient is φ = 8079000.

The previous prime is 20197549. The next prime is 20197561. The reversal of 20197550 is 5579102.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 201926 + ... + 202025.

It is an arithmetic number, because the mean of its divisors is an integer number (3130628).

Almost surely, 2^20197550 is an apocalyptic number.

20197550 is a deficient number, since it is larger than the sum of its proper divisors (17369986).

20197550 is a wasteful number, since it uses less digits than its factorization.

20197550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403963 (or 403958 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 20197550 is about 4494.1684436612. The cubic root of 20197550 is about 272.3325571219.

The spelling of 20197550 in words is "twenty million, one hundred ninety-seven thousand, five hundred fifty".