1981098020 has 24 divisors (see below), whose sum is σ = 4538515968. Its totient is φ = 720399200.

The previous prime is 1981098011. The next prime is 1981098029. The reversal of 1981098020 is 208901891.

It is an interprime number because it is at equal distance from previous prime (1981098011) and next prime (1981098029).

It is not an unprimeable number, because it can be changed into a prime (1981098029) 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, 4502276 + ... + 4502715.

It is an arithmetic number, because the mean of its divisors is an integer number (189104832).

Almost surely, 2^1981098020 is an apocalyptic number.

1981098020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1981098020 is an abundant number, since it is smaller than the sum of its proper divisors (2557417948).

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

1981098020 is a wasteful number, since it uses less digits than its factorization.

1981098020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9005011 (or 9005009 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 1981098020 is about 44509.5272947265. The cubic root of 1981098020 is about 1255.9393125572.

The spelling of 1981098020 in words is "one billion, nine hundred eighty-one million, ninety-eight thousand, twenty".