20206191745 has 16 divisors (see below), whose sum is σ = 25246040400. Its totient is φ = 15512140800.

The previous prime is 20206191683. The next prime is 20206191751. The reversal of 20206191745 is 54719160202.

It can be written as a sum of positive squares in 8 ways, for example, as 5466532096 + 14739659649 = 73936^2 + 121407^2 .

It is not a de Polignac number, because 20206191745 - 2⁹ = 20206191233 is a prime.

It is a super-2 number, since 2×20206191745² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 795420 + ... + 820429.

It is an arithmetic number, because the mean of its divisors is an integer number (1577877525).

Almost surely, 2^20206191745 is an apocalyptic number.

It is an amenable number.

20206191745 is a deficient number, since it is larger than the sum of its proper divisors (5039848655).

20206191745 is a wasteful number, since it uses less digits than its factorization.

20206191745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615956.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 20206191745 in words is "twenty billion, two hundred six million, one hundred ninety-one thousand, seven hundred forty-five".