20533231157345 has 4 divisors (see below), whose sum is σ = 24639877388820. Its totient is φ = 16426584925872.

The previous prime is 20533231157297. The next prime is 20533231157371. The reversal of 20533231157345 is 54375113233502.

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 11264427487504 + 9268803669841 = 3356252^2 + 3044471^2 .

It is a cyclic number.

It is not a de Polignac number, because 20533231157345 - 2¹⁶ = 20533231091809 is a prime.

It is a super-2 number, since 2×20533231157345² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20533231157296 and 20533231157305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2053323115730 + ... + 2053323115739.

It is an arithmetic number, because the mean of its divisors is an integer number (6159969347205).

Almost surely, 2^{20533231157345} is an apocalyptic number.

It is an amenable number.

20533231157345 is a deficient number, since it is larger than the sum of its proper divisors (4106646231475).

20533231157345 is an equidigital number, since it uses as much as digits as its factorization.

20533231157345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4106646231474.

The product of its (nonzero) digits is 1134000, while the sum is 44.

The spelling of 20533231157345 in words is "twenty trillion, five hundred thirty-three billion, two hundred thirty-one million, one hundred fifty-seven thousand, three hundred forty-five".