20695745 has 32 divisors (see below), whose sum is σ = 30302208. Its totient is φ = 13261248.

The previous prime is 20695729. The next prime is 20695747. The reversal of 20695745 is 54759602.

It is a happy number.

It is not a de Polignac number, because 20695745 - 2⁴ = 20695729 is a prime.

It is a super-2 number, since 2×20695745² = 856627722210050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20695699 and 20695708.

It is not an unprimeable number, because it can be changed into a prime (20695747) 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 31 ways as a sum of consecutive naturals, for example, 37562 + ... + 38108.

It is an arithmetic number, because the mean of its divisors is an integer number (946944).

Almost surely, 2^20695745 is an apocalyptic number.

It is an amenable number.

20695745 is a deficient number, since it is larger than the sum of its proper divisors (9606463).

20695745 is a wasteful number, since it uses less digits than its factorization.

20695745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 20695745 is about 4549.2576317461. The cubic root of 20695745 is about 274.5535234487.

The spelling of 20695745 in words is "twenty million, six hundred ninety-five thousand, seven hundred forty-five".