20749635 has 16 divisors (see below), whose sum is σ = 36888480. Its totient is φ = 11066400.

The previous prime is 20749627. The next prime is 20749661. The reversal of 20749635 is 53694702.

It is not a de Polignac number, because 20749635 - 2³ = 20749627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20749635.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 76716 + ... + 76985.

It is an arithmetic number, because the mean of its divisors is an integer number (2305530).

Almost surely, 2^20749635 is an apocalyptic number.

20749635 is a deficient number, since it is larger than the sum of its proper divisors (16138845).

20749635 is a wasteful number, since it uses less digits than its factorization.

20749635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153715 (or 153709 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 20749635 is about 4555.1767254411. The cubic root of 20749635 is about 274.7916217579.

The spelling of 20749635 in words is "twenty million, seven hundred forty-nine thousand, six hundred thirty-five".