20021009278628 has 48 divisors (see below), whose sum is σ = 36540898910208. Its totient is φ = 9587944464000.

The previous prime is 20021009278591. The next prime is 20021009278661. The reversal of 20021009278628 is 82687290012002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2520218 + ... + 6811278.

It is an arithmetic number, because the mean of its divisors is an integer number (761268727296).

Almost surely, 2^{20021009278628} is an apocalyptic number.

It is an amenable number.

20021009278628 is a deficient number, since it is larger than the sum of its proper divisors (16519889631580).

20021009278628 is a wasteful number, since it uses less digits than its factorization.

20021009278628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4291484 (or 4291482 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 20021009278628 in words is "twenty trillion, twenty-one billion, nine million, two hundred seventy-eight thousand, six hundred twenty-eight".