20545425 has 36 divisors (see below), whose sum is σ = 37140480. Its totient is φ = 10856160.

The previous prime is 20545423. The next prime is 20545433. The reversal of 20545425 is 52454502.

20545425 is a `hidden beast` number, since 205 + 454 + 2 + 5 = 666.

It is not a de Polignac number, because 20545425 - 2¹ = 20545423 is a prime.

It is a super-2 number, since 2×20545425² = 844228976861250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20545423) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28216 + ... + 28934.

It is an arithmetic number, because the mean of its divisors is an integer number (1031680).

Almost surely, 2^20545425 is an apocalyptic number.

20545425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20545425 is a deficient number, since it is larger than the sum of its proper divisors (16595055).

20545425 is a wasteful number, since it uses less digits than its factorization.

20545425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 854 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 20545425 is about 4532.7061453397. The cubic root of 20545425 is about 273.8871833847.

Adding to 20545425 its reverse (52454502), we get a palindrome (72999927).

The spelling of 20545425 in words is "twenty million, five hundred forty-five thousand, four hundred twenty-five".