20197558015 has 8 divisors (see below), whose sum is σ = 24247653408. Its totient is φ = 16150990560.

The previous prime is 20197558013. The next prime is 20197558057. The reversal of 20197558015 is 51085579102.

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

It is not a de Polignac number, because 20197558015 - 2¹ = 20197558013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20197558013) by changing a digit.

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, 869371 + ... + 892300.

It is an arithmetic number, because the mean of its divisors is an integer number (3030956676).

Almost surely, 2^20197558015 is an apocalyptic number.

20197558015 is a deficient number, since it is larger than the sum of its proper divisors (4050095393).

20197558015 is a wasteful number, since it uses less digits than its factorization.

20197558015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1763969.

The product of its (nonzero) digits is 126000, while the sum is 43.

The spelling of 20197558015 in words is "twenty billion, one hundred ninety-seven million, five hundred fifty-eight thousand, fifteen".