20831012787730 has 16 divisors (see below), whose sum is σ = 37497228836184. Its totient is φ = 8332092711040.

The previous prime is 20831012787701. The next prime is 20831012787763. The reversal of 20831012787730 is 3778721013802.

It can be written as a sum of positive squares in 4 ways, for example, as 15966089986081 + 4864922801649 = 3995759^2 + 2205657^2 .

It is a super-3 number, since 3×20831012787730³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38770357 + ... + 39303976.

Almost surely, 2^{20831012787730} is an apocalyptic number.

20831012787730 is a deficient number, since it is larger than the sum of its proper divisors (16666216048454).

20831012787730 is a wasteful number, since it uses less digits than its factorization.

20831012787730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78101021.

The product of its (nonzero) digits is 790272, while the sum is 49.

The spelling of 20831012787730 in words is "twenty trillion, eight hundred thirty-one billion, twelve million, seven hundred eighty-seven thousand, seven hundred thirty".