20741745 has 32 divisors (see below), whose sum is σ = 35251200. Its totient is φ = 10391744.

The previous prime is 20741731. The next prime is 20741753. The reversal of 20741745 is 54714702.

It is a cyclic number.

It is not a de Polignac number, because 20741745 - 2⁴ = 20741729 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19846 + ... + 20864.

It is an arithmetic number, because the mean of its divisors is an integer number (1101600).

Almost surely, 2^20741745 is an apocalyptic number.

It is an amenable number.

20741745 is a deficient number, since it is larger than the sum of its proper divisors (14509455).

20741745 is a wasteful number, since it uses less digits than its factorization.

20741745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109.

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 20741745 is about 4554.3105954689. The cubic root of 20741745 is about 274.7567877193.

The spelling of 20741745 in words is "twenty million, seven hundred forty-one thousand, seven hundred forty-five".