20621022642 has 24 divisors (see below), whose sum is σ = 48740599440. Its totient is φ = 6248794680.

The previous prime is 20621022607. The next prime is 20621022679. The reversal of 20621022642 is 24622012602.

It is a happy number.

20621022642 is a `hidden beast` number, since 2 + 0 + 6 + 2 + 10 + 2 + 2 + 642 = 666.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 52073092 + ... + 52073487.

It is an arithmetic number, because the mean of its divisors is an integer number (2030858310).

Almost surely, 2^20621022642 is an apocalyptic number.

20621022642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20621022642 is an abundant number, since it is smaller than the sum of its proper divisors (28119576798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20621022642 is a wasteful number, since it uses less digits than its factorization.

20621022642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104146598 (or 104146595 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The spelling of 20621022642 in words is "twenty billion, six hundred twenty-one million, twenty-two thousand, six hundred forty-two".