20021572277 has 8 divisors (see below), whose sum is σ = 22882774656. Its totient is φ = 17160614352.

The previous prime is 20021572229. The next prime is 20021572309. The reversal of 20021572277 is 77227512002.

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

It is not a de Polignac number, because 20021572277 - 2¹² = 20021568181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021572477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175463 + ... + 266139.

It is an arithmetic number, because the mean of its divisors is an integer number (2860346832).

Almost surely, 2^20021572277 is an apocalyptic number.

It is an amenable number.

20021572277 is a deficient number, since it is larger than the sum of its proper divisors (2861202379).

20021572277 is an equidigital number, since it uses as much as digits as its factorization.

20021572277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122227.

The product of its (nonzero) digits is 27440, while the sum is 35.

The spelling of 20021572277 in words is "twenty billion, twenty-one million, five hundred seventy-two thousand, two hundred seventy-seven".