20988696918 has 16 divisors (see below), whose sum is σ = 47974164480. Its totient is φ = 5996770536.

The previous prime is 20988696877. The next prime is 20988696919. The reversal of 20988696918 is 81969688902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20988696919) 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, 249865398 + ... + 249865481.

It is an arithmetic number, because the mean of its divisors is an integer number (2998385280).

Almost surely, 2^20988696918 is an apocalyptic number.

20988696918 is an abundant number, since it is smaller than the sum of its proper divisors (26985467562).

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

20988696918 is a wasteful number, since it uses less digits than its factorization.

20988696918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499730891.

The product of its (nonzero) digits is 26873856, while the sum is 66.

The spelling of 20988696918 in words is "twenty billion, nine hundred eighty-eight million, six hundred ninety-six thousand, nine hundred eighteen".