20019703081 has 81 divisors (see below), whose sum is σ = 26261326767. Its totient is φ = 15213112320.

The previous prime is 20019703069. The next prime is 20019703133. The reversal of 20019703081 is 18030791002.

The square root of 20019703081 is 141491.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 14707625625 + 5312077456 = 121275^2 + 72884^2 .

It is not a de Polignac number, because 20019703081 - 2⁷ = 20019702953 is a prime.

It is a super-2 number, since 2×20019703081² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20019703031) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 488285421 + ... + 488285461.

Almost surely, 2^20019703081 is an apocalyptic number.

20019703081 is the 141491-st square number.

20019703081 is the 70746-th centered octagonal number.

It is an amenable number.

20019703081 is a deficient number, since it is larger than the sum of its proper divisors (6241623686).

20019703081 is an equidigital number, since it uses as much as digits as its factorization.

20019703081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The spelling of 20019703081 in words is "twenty billion, nineteen million, seven hundred three thousand, eighty-one".