20897055 has 32 divisors (see below), whose sum is σ = 39110400. Its totient is φ = 10557216.

The previous prime is 20897047. The next prime is 20897057. The reversal of 20897055 is 55079802.

It is not a de Polignac number, because 20897055 - 2³ = 20897047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20897057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1509 + ... + 6638.

It is an arithmetic number, because the mean of its divisors is an integer number (1222200).

Almost surely, 2^20897055 is an apocalyptic number.

20897055 is a deficient number, since it is larger than the sum of its proper divisors (18213345).

20897055 is a wasteful number, since it uses less digits than its factorization.

20897055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8180 (or 8174 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 20897055 is about 4571.3296752695. The cubic root of 20897055 is about 275.4408576136.

The spelling of 20897055 in words is "twenty million, eight hundred ninety-seven thousand, fifty-five".