20477603345 has 4 divisors (see below), whose sum is σ = 24573124020. Its totient is φ = 16382082672.

The previous prime is 20477603339. The next prime is 20477603387. The reversal of 20477603345 is 54330677402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54330677402 = 2 ⋅27165338701.

It can be written as a sum of positive squares in 2 ways, for example, as 7940770321 + 12536833024 = 89111^2 + 111968^2 .

It is a cyclic number.

It is not a de Polignac number, because 20477603345 - 2³⁴ = 3297734161 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, 2047760330 + ... + 2047760339.

It is an arithmetic number, because the mean of its divisors is an integer number (6143281005).

Almost surely, 2^20477603345 is an apocalyptic number.

It is an amenable number.

20477603345 is a deficient number, since it is larger than the sum of its proper divisors (4095520675).

20477603345 is an equidigital number, since it uses as much as digits as its factorization.

20477603345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4095520674.

The product of its (nonzero) digits is 423360, while the sum is 41.

The spelling of 20477603345 in words is "twenty billion, four hundred seventy-seven million, six hundred three thousand, three hundred forty-five".