20919227 has 16 divisors (see below), whose sum is σ = 24768000. Its totient is φ = 17657640.

The previous prime is 20919211. The next prime is 20919229. The reversal of 20919227 is 72291902.

It is not a de Polignac number, because 20919227 - 2⁴ = 20919211 is a prime.

It is a super-2 number, since 2×20919227² = 875228116555058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20919193 and 20919202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20919229) 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 15 ways as a sum of consecutive naturals, for example, 23924 + ... + 24782.

It is an arithmetic number, because the mean of its divisors is an integer number (1548000).

Almost surely, 2^20919227 is an apocalyptic number.

20919227 is a deficient number, since it is larger than the sum of its proper divisors (3848773).

20919227 is an frugal number, since it uses more digits than its factorization.

20919227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951 (or 937 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20919227 is about 4573.7541473061. The cubic root of 20919227 is about 275.5382384180.

The spelling of 20919227 in words is "twenty million, nine hundred nineteen thousand, two hundred twenty-seven".