20000643542 has 8 divisors (see below), whose sum is σ = 32728325832. Its totient is φ = 9091201600.

The previous prime is 20000643511. The next prime is 20000643601. The reversal of 20000643542 is 24534600002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454560059 + ... + 454560102.

It is an arithmetic number, because the mean of its divisors is an integer number (4091040729).

Almost surely, 2^20000643542 is an apocalyptic number.

20000643542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20000643542 is a deficient number, since it is larger than the sum of its proper divisors (12727682290).

20000643542 is a wasteful number, since it uses less digits than its factorization.

20000643542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909120174.

The product of its (nonzero) digits is 5760, while the sum is 26.

The spelling of 20000643542 in words is "twenty billion, six hundred forty-three thousand, five hundred forty-two".