20919238 has 16 divisors (see below), whose sum is σ = 31918176. Its totient is φ = 10281600.

The previous prime is 20919229. The next prime is 20919251. The reversal of 20919238 is 83291902.

It is a super-2 number, since 2×20919238² = 875229037001288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33820 + ... + 34432.

It is an arithmetic number, because the mean of its divisors is an integer number (1994886).

Almost surely, 2^20919238 is an apocalyptic number.

20919238 is a deficient number, since it is larger than the sum of its proper divisors (10998938).

20919238 is a wasteful number, since it uses less digits than its factorization.

20919238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 20919238 is about 4573.7553498192. The cubic root of 20919238 is about 275.5382867136.

The spelling of 20919238 in words is "twenty million, nine hundred nineteen thousand, two hundred thirty-eight".