20420220321 has 12 divisors (see below), whose sum is σ = 29531550672. Its totient is φ = 13597013976.

The previous prime is 20420220319. The next prime is 20420220343. The reversal of 20420220321 is 12302202402.

20420220321 is a `hidden beast` number, since 2 + 0 + 420 + 220 + 3 + 21 = 666.

It is not a de Polignac number, because 20420220321 - 2¹ = 20420220319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20420220294 and 20420220303.

It is not an unprimeable number, because it can be changed into a prime (20420200321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1364331 + ... + 1379216.

It is an arithmetic number, because the mean of its divisors is an integer number (2460962556).

Almost surely, 2^20420220321 is an apocalyptic number.

It is an amenable number.

20420220321 is a deficient number, since it is larger than the sum of its proper divisors (9111330351).

20420220321 is a wasteful number, since it uses less digits than its factorization.

20420220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744380 (or 2744377 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20420220321 its reverse (12302202402), we get a palindrome (32722422723).

The spelling of 20420220321 in words is "twenty billion, four hundred twenty million, two hundred twenty thousand, three hundred twenty-one".