20265405 has 8 divisors (see below), whose sum is σ = 32424672. Its totient is φ = 10808208.

The previous prime is 20265391. The next prime is 20265407. The reversal of 20265405 is 50456202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20265405 - 2¹⁰ = 20264381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20265407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 675499 + ... + 675528.

It is an arithmetic number, because the mean of its divisors is an integer number (4053084).

Almost surely, 2^20265405 is an apocalyptic number.

It is an amenable number.

20265405 is a deficient number, since it is larger than the sum of its proper divisors (12159267).

20265405 is a wasteful number, since it uses less digits than its factorization.

20265405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351035.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20265405 is about 4501.7113412568. The cubic root of 20265405 is about 272.6371892886.

The spelling of 20265405 in words is "twenty million, two hundred sixty-five thousand, four hundred five".