20420105375 has 8 divisors (see below), whose sum is σ = 25484291664. Its totient is φ = 16336084200.

The previous prime is 20420105359. The next prime is 20420105389. The reversal of 20420105375 is 57350102402.

It is a happy number.

It is not a de Polignac number, because 20420105375 - 2⁴ = 20420105359 is a prime.

It is a super-2 number, since 2×20420105375² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81680297 + ... + 81680546.

It is an arithmetic number, because the mean of its divisors is an integer number (3185536458).

Almost surely, 2^20420105375 is an apocalyptic number.

20420105375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20420105375 is a deficient number, since it is larger than the sum of its proper divisors (5064186289).

20420105375 is an equidigital number, since it uses as much as digits as its factorization.

20420105375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163360858 (or 163360848 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

Adding to 20420105375 its reverse (57350102402), we get a palindrome (77770207777).

The spelling of 20420105375 in words is "twenty billion, four hundred twenty million, one hundred five thousand, three hundred seventy-five".