20400220353 has 8 divisors (see below), whose sum is σ = 27202900608. Its totient is φ = 13598843504.

The previous prime is 20400220343. The next prime is 20400220361. The reversal of 20400220353 is 35302200402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20400220353 - 2⁶ = 20400220289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20400220343) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 288726 + ... + 352367.

It is an arithmetic number, because the mean of its divisors is an integer number (3400362576).

Almost surely, 2^20400220353 is an apocalyptic number.

It is an amenable number.

20400220353 is a deficient number, since it is larger than the sum of its proper divisors (6802680255).

20400220353 is a wasteful number, since it uses less digits than its factorization.

20400220353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651703.

The product of its (nonzero) digits is 1440, while the sum is 21.

Adding to 20400220353 its reverse (35302200402), we get a palindrome (55702420755).

The spelling of 20400220353 in words is "twenty billion, four hundred million, two hundred twenty thousand, three hundred fifty-three".