20906355 has 16 divisors (see below), whose sum is σ = 34018560. Its totient is φ = 10960608.

The previous prime is 20906341. The next prime is 20906371. The reversal of 20906355 is 55360902.

It is not a de Polignac number, because 20906355 - 2⁷ = 20906227 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10927 + ... + 12696.

It is an arithmetic number, because the mean of its divisors is an integer number (2126160).

Almost surely, 2^20906355 is an apocalyptic number.

20906355 is a deficient number, since it is larger than the sum of its proper divisors (13112205).

20906355 is a wasteful number, since it uses less digits than its factorization.

20906355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23690.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 20906355 is about 4572.3467716261. The cubic root of 20906355 is about 275.4817121752.

The spelling of 20906355 in words is "twenty million, nine hundred six thousand, three hundred fifty-five".