20220021987 has 8 divisors (see below), whose sum is σ = 29410941120. Its totient is φ = 12254558760.

The previous prime is 20220021919. The next prime is 20220022007. The reversal of 20220021987 is 78912002202.

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

It is not a de Polignac number, because 20220021987 - 2⁷ = 20220021859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 612727939 = 20220021987 / (2 + 0 + 2 + 2 + 0 + 0 + 2 + 1 + 9 + 8 + 7).

It is not an unprimeable number, because it can be changed into a prime (20220021587) 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, 306363937 + ... + 306364002.

It is an arithmetic number, because the mean of its divisors is an integer number (3676367640).

Almost surely, 2^20220021987 is an apocalyptic number.

20220021987 is a deficient number, since it is larger than the sum of its proper divisors (9190919133).

20220021987 is a wasteful number, since it uses less digits than its factorization.

20220021987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612727953.

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 20220021987 in words is "twenty billion, two hundred twenty million, twenty-one thousand, nine hundred eighty-seven".