20021225405 has 8 divisors (see below), whose sum is σ = 24158208984. Its totient is φ = 15928488000.

The previous prime is 20021225383. The next prime is 20021225417. The reversal of 20021225405 is 50452212002.

It can be written as a sum of positive squares in 4 ways, for example, as 103266244 + 19917959161 = 10162^2 + 141131^2 .

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

It is not a de Polignac number, because 20021225405 - 2¹⁶ = 20021159869 is a prime.

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, 11060546 + ... + 11062355.

It is an arithmetic number, because the mean of its divisors is an integer number (3019776123).

Almost surely, 2^20021225405 is an apocalyptic number.

It is an amenable number.

20021225405 is a deficient number, since it is larger than the sum of its proper divisors (4136983579).

20021225405 is a wasteful number, since it uses less digits than its factorization.

20021225405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22123087.

The product of its (nonzero) digits is 1600, while the sum is 23.

Adding to 20021225405 its reverse (50452212002), we get a palindrome (70473437407).

The spelling of 20021225405 in words is "twenty billion, twenty-one million, two hundred twenty-five thousand, four hundred five".