20621022655 has 8 divisors (see below), whose sum is σ = 24749400384. Its totient is φ = 16494036000.

The previous prime is 20621022607. The next prime is 20621022679. The reversal of 20621022655 is 55622012602.

It is a happy number.

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

It is not a de Polignac number, because 20621022655 - 2⁹ = 20621022143 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, 314871 + ... + 374680.

It is an arithmetic number, because the mean of its divisors is an integer number (3093675048).

Almost surely, 2^20621022655 is an apocalyptic number.

20621022655 is a deficient number, since it is larger than the sum of its proper divisors (4128377729).

20621022655 is an equidigital number, since it uses as much as digits as its factorization.

20621022655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695537.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 20621022655 in words is "twenty billion, six hundred twenty-one million, twenty-two thousand, six hundred fifty-five".