20420360503 has 4 divisors (see below), whose sum is σ = 21308202288. Its totient is φ = 19532518720.

The previous prime is 20420360491. The next prime is 20420360507. The reversal of 20420360503 is 30506302402.

It is a happy number.

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 20420360503 - 2²¹ = 20418263351 is a prime.

It is a super-2 number, since 2×20420360503² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420360507) 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, 443920858 + ... + 443920903.

It is an arithmetic number, because the mean of its divisors is an integer number (5327050572).

Almost surely, 2^20420360503 is an apocalyptic number.

20420360503 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20420360503 is a deficient number, since it is larger than the sum of its proper divisors (887841785).

20420360503 is an equidigital number, since it uses as much as digits as its factorization.

20420360503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887841784.

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 20420360503 its reverse (30506302402), we get a palindrome (50926662905).

The spelling of 20420360503 in words is "twenty billion, four hundred twenty million, three hundred sixty thousand, five hundred three".