20298335981 has 32 divisors (see below), whose sum is σ = 26769235968. Its totient is φ = 14921850240.

The previous prime is 20298335977. The next prime is 20298335989. The reversal of 20298335981 is 18953389202.

It is not a de Polignac number, because 20298335981 - 2² = 20298335977 is a prime.

It is a super-2 number, since 2×20298335981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20298335989) 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 31 ways as a sum of consecutive naturals, for example, 50780 + ... + 207786.

It is an arithmetic number, because the mean of its divisors is an integer number (836538624).

Almost surely, 2^20298335981 is an apocalyptic number.

It is an amenable number.

20298335981 is a deficient number, since it is larger than the sum of its proper divisors (6470899987).

20298335981 is a wasteful number, since it uses less digits than its factorization.

20298335981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157121.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 20298335981 in words is "twenty billion, two hundred ninety-eight million, three hundred thirty-five thousand, nine hundred eighty-one".