20635745 has 12 divisors (see below), whose sum is σ = 26815356. Its totient is φ = 15238080.

The previous prime is 20635723. The next prime is 20635787. The reversal of 20635745 is 54753602.

It can be written as a sum of positive squares in 6 ways, for example, as 11641744 + 8994001 = 3412^2 + 2999^2 .

It is not a de Polignac number, because 20635745 - 2¹² = 20631649 is a prime.

It is a super-3 number, since 3×20635745³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian 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 11 ways as a sum of consecutive naturals, for example, 11366 + ... + 13055.

It is an arithmetic number, because the mean of its divisors is an integer number (2234613).

Almost surely, 2^20635745 is an apocalyptic number.

It is an amenable number.

20635745 is a deficient number, since it is larger than the sum of its proper divisors (6179611).

20635745 is a wasteful number, since it uses less digits than its factorization.

20635745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24452 (or 24439 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 20635745 is about 4542.6583626771. The cubic root of 20635745 is about 274.2879429873.

The spelling of 20635745 in words is "twenty million, six hundred thirty-five thousand, seven hundred forty-five".