20225215555 has 8 divisors (see below), whose sum is σ = 24280483392. Its totient is φ = 16173355968.

The previous prime is 20225215541. The next prime is 20225215601. The reversal of 20225215555 is 55551252202.

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 20225215555 - 2²³ = 20216826947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20225215555.

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, 838987 + ... + 862756.

It is an arithmetic number, because the mean of its divisors is an integer number (3035060424).

Almost surely, 2^20225215555 is an apocalyptic number.

20225215555 is a deficient number, since it is larger than the sum of its proper divisors (4055267837).

20225215555 is a wasteful number, since it uses less digits than its factorization.

20225215555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704125.

The product of its (nonzero) digits is 50000, while the sum is 34.

Adding to 20225215555 its reverse (55551252202), we get a palindrome (75776467757).

The spelling of 20225215555 in words is "twenty billion, two hundred twenty-five million, two hundred fifteen thousand, five hundred fifty-five".