20747425 has 12 divisors (see below), whose sum is σ = 25784560. Its totient is φ = 16560720.

The previous prime is 20747423. The next prime is 20747431. The reversal of 20747425 is 52474702.

It is not a de Polignac number, because 20747425 - 2¹ = 20747423 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20747423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17914 + ... + 19036.

Almost surely, 2^20747425 is an apocalyptic number.

20747425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20747425 is a deficient number, since it is larger than the sum of its proper divisors (5037135).

20747425 is a wasteful number, since it uses less digits than its factorization.

20747425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872 (or 1867 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 31.

The square root of 20747425 is about 4554.9341378334. The cubic root of 20747425 is about 274.7818655855.

The spelling of 20747425 in words is "twenty million, seven hundred forty-seven thousand, four hundred twenty-five".