20500377043 has 4 divisors (see below), whose sum is σ = 21391697808. Its totient is φ = 19609056280.

The previous prime is 20500377041. The next prime is 20500377049. The reversal of 20500377043 is 34077300502.

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

It is a cyclic number.

It is not a de Polignac number, because 20500377043 - 2¹ = 20500377041 is a prime.

It is a super-2 number, since 2×20500377043² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20500376996 and 20500377014.

It is not an unprimeable number, because it can be changed into a prime (20500377041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445660348 + ... + 445660393.

It is an arithmetic number, because the mean of its divisors is an integer number (5347924452).

Almost surely, 2^20500377043 is an apocalyptic number.

20500377043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20500377043 is a deficient number, since it is larger than the sum of its proper divisors (891320765).

20500377043 is an equidigital number, since it uses as much as digits as its factorization.

20500377043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891320764.

The product of its (nonzero) digits is 17640, while the sum is 31.

Adding to 20500377043 its reverse (34077300502), we get a palindrome (54577677545).

The spelling of 20500377043 in words is "twenty billion, five hundred million, three hundred seventy-seven thousand, forty-three".