20747475 has 48 divisors (see below), whose sum is σ = 43568640. Its totient is φ = 9482400.

The previous prime is 20747473. The next prime is 20747479. The reversal of 20747475 is 57474702.

It is a happy number.

It is not a de Polignac number, because 20747475 - 2¹ = 20747473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20747471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2530 + ... + 6920.

It is an arithmetic number, because the mean of its divisors is an integer number (907680).

Almost surely, 2^20747475 is an apocalyptic number.

20747475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20747475 is an abundant number, since it is smaller than the sum of its proper divisors (22821165).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20747475 is a wasteful number, since it uses less digits than its factorization.

20747475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4417 (or 4406 counting only the distinct ones).

The product of its (nonzero) digits is 54880, while the sum is 36.

The square root of 20747475 is about 4554.9396263836. The cubic root of 20747475 is about 274.7820863211.

The spelling of 20747475 in words is "twenty million, seven hundred forty-seven thousand, four hundred seventy-five".