20919581072990 has 16 divisors (see below), whose sum is σ = 37658542578048. Its totient is φ = 8367099841056.

The previous prime is 20919581072963. The next prime is 20919581073049. The reversal of 20919581072990 is 9927018591902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91453577 + ... + 91682036.

It is an arithmetic number, because the mean of its divisors is an integer number (2353658911128).

Almost surely, 2^{20919581072990} is an apocalyptic number.

20919581072990 is a deficient number, since it is larger than the sum of its proper divisors (16738961505058).

20919581072990 is a wasteful number, since it uses less digits than its factorization.

20919581072990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183147043.

The product of its (nonzero) digits is 7348320, while the sum is 62.

The spelling of 20919581072990 in words is "twenty trillion, nine hundred nineteen billion, five hundred eighty-one million, seventy-two thousand, nine hundred ninety".