20649475 has 48 divisors (see below), whose sum is σ = 33854976. Its totient is φ = 12096000.

The previous prime is 20649451. The next prime is 20649481. The reversal of 20649475 is 57494602.

It is not a de Polignac number, because 20649475 - 2⁷ = 20649347 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 32410 + ... + 33040.

It is an arithmetic number, because the mean of its divisors is an integer number (705312).

Almost surely, 2^20649475 is an apocalyptic number.

20649475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20649475 is a deficient number, since it is larger than the sum of its proper divisors (13205501).

20649475 is a wasteful number, since it uses less digits than its factorization.

20649475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 20649475 is about 4544.1693410347. The cubic root of 20649475 is about 274.3487620263.

The spelling of 20649475 in words is "twenty million, six hundred forty-nine thousand, four hundred seventy-five".