101720820380 has 24 divisors (see below), whose sum is σ = 215172952848. Its totient is φ = 40391331968.

The previous prime is 101720820343. The next prime is 101720820437. The reversal of 101720820380 is 83028027101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18559454 + ... + 18564933.

It is an arithmetic number, because the mean of its divisors is an integer number (8965539702).

Almost surely, 2^101720820380 is an apocalyptic number.

101720820380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101720820380 is an abundant number, since it is smaller than the sum of its proper divisors (113452132468).

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

101720820380 is a wasteful number, since it uses less digits than its factorization.

101720820380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37124533 (or 37124531 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

Adding to 101720820380 its reverse (83028027101), we get a palindrome (184748847481).

The spelling of 101720820380 in words is "one hundred one billion, seven hundred twenty million, eight hundred twenty thousand, three hundred eighty".