20112820745 has 4 divisors (see below), whose sum is σ = 24135384900. Its totient is φ = 16090256592.

The previous prime is 20112820687. The next prime is 20112820757. The reversal of 20112820745 is 54702821102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4482570304 + 15630250441 = 66952^2 + 125021^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112820745 - 2⁸ = 20112820489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2011282070 + ... + 2011282079.

It is an arithmetic number, because the mean of its divisors is an integer number (6033846225).

Almost surely, 2^20112820745 is an apocalyptic number.

It is an amenable number.

20112820745 is a deficient number, since it is larger than the sum of its proper divisors (4022564155).

20112820745 is an equidigital number, since it uses as much as digits as its factorization.

20112820745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022564154.

The product of its (nonzero) digits is 8960, while the sum is 32.

The spelling of 20112820745 in words is "twenty billion, one hundred twelve million, eight hundred twenty thousand, seven hundred forty-five".