20919265 has 24 divisors (see below), whose sum is σ = 27585792. Its totient is φ = 15210240.

The previous prime is 20919263. The next prime is 20919271. The reversal of 20919265 is 56291902.

It is not a de Polignac number, because 20919265 - 2¹ = 20919263 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20919265.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20919263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44562 + ... + 45028.

It is an arithmetic number, because the mean of its divisors is an integer number (1149408).

Almost surely, 2^20919265 is an apocalyptic number.

It is an amenable number.

20919265 is a deficient number, since it is larger than the sum of its proper divisors (6666527).

20919265 is a wasteful number, since it uses less digits than its factorization.

20919265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 20919265 is about 4573.7583014409. The cubic root of 20919265 is about 275.5384052573.

The spelling of 20919265 in words is "twenty million, nine hundred nineteen thousand, two hundred sixty-five".