20225405 has 16 divisors (see below), whose sum is σ = 25694400. Its totient is φ = 15240960.

The previous prime is 20225371. The next prime is 20225419. The reversal of 20225405 is 50452202.

It is not a de Polignac number, because 20225405 - 2¹⁸ = 19963261 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19541 + ... + 20549.

It is an arithmetic number, because the mean of its divisors is an integer number (1605900).

Almost surely, 2^20225405 is an apocalyptic number.

It is an amenable number.

20225405 is a deficient number, since it is larger than the sum of its proper divisors (5468995).

20225405 is a wasteful number, since it uses less digits than its factorization.

20225405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 20225405 is about 4497.2663919319. The cubic root of 20225405 is about 272.4576934012.

Adding to 20225405 its reverse (50452202), we get a palindrome (70677607).

The spelling of 20225405 in words is "twenty million, two hundred twenty-five thousand, four hundred five".