20989948562 has 16 divisors (see below), whose sum is σ = 34577712000. Its totient is φ = 9476851440.

The previous prime is 20989948561. The next prime is 20989948607. The reversal of 20989948562 is 26584998902.

It is a junction number, because it is equal to n+sod(n) for n = 20989948495 and 20989948504.

It is not an unprimeable number, because it can be changed into a prime (20989948561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3198362 + ... + 3204917.

It is an arithmetic number, because the mean of its divisors is an integer number (2161107000).

Almost surely, 2^20989948562 is an apocalyptic number.

20989948562 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20989948562 is a deficient number, since it is larger than the sum of its proper divisors (13587763438).

20989948562 is a wasteful number, since it uses less digits than its factorization.

20989948562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6403441.

The product of its (nonzero) digits is 22394880, while the sum is 62.

The spelling of 20989948562 in words is "twenty billion, nine hundred eighty-nine million, nine hundred forty-eight thousand, five hundred sixty-two".