20998311708 has 24 divisors (see below), whose sum is σ = 53450248320. Its totient is φ = 6363124720.

The previous prime is 20998311707. The next prime is 20998311709. The reversal of 20998311708 is 80711389902.

It is an interprime number because it is at equal distance from previous prime (20998311707) and next prime (20998311709).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20998311707) 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, 79538928 + ... + 79539191.

It is an arithmetic number, because the mean of its divisors is an integer number (2227093680).

Almost surely, 2^20998311708 is an apocalyptic number.

It is an amenable number.

20998311708 is an abundant number, since it is smaller than the sum of its proper divisors (32451936612).

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

20998311708 is a wasteful number, since it uses less digits than its factorization.

20998311708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159078137 (or 159078135 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The spelling of 20998311708 in words is "twenty billion, nine hundred ninety-eight million, three hundred eleven thousand, seven hundred eight".