20643923091140 has 48 divisors (see below), whose sum is σ = 44785202778624. Its totient is φ = 7985034432000.

The previous prime is 20643923091137. The next prime is 20643923091161. The reversal of 20643923091140 is 4119032934602.

It is a junction number, because it is equal to n+sod(n) for n = 20643923091091 and 20643923091100.

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 15 ways as a sum of consecutive naturals, for example, 12031886 + ... + 13640165.

It is an arithmetic number, because the mean of its divisors is an integer number (933025057888).

Almost surely, 2^{20643923091140} is an apocalyptic number.

20643923091140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20643923091140 is an abundant number, since it is smaller than the sum of its proper divisors (24141279687484).

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

20643923091140 is a wasteful number, since it uses less digits than its factorization.

20643923091140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25673388 (or 25673386 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The spelling of 20643923091140 in words is "twenty trillion, six hundred forty-three billion, nine hundred twenty-three million, ninety-one thousand, one hundred forty".