20615891490146 has 32 divisors (see below), whose sum is σ = 33111269990400. Its totient is φ = 9598572219600.

The previous prime is 20615891490133. The next prime is 20615891490169. The reversal of 20615891490146 is 64109419851602.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20615891490091 and 20615891490100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14728280 + ... + 16067171.

It is an arithmetic number, because the mean of its divisors is an integer number (1034727187200).

Almost surely, 2^{20615891490146} is an apocalyptic number.

20615891490146 is a deficient number, since it is larger than the sum of its proper divisors (12495378500254).

20615891490146 is a wasteful number, since it uses less digits than its factorization.

20615891490146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30795774.

The product of its (nonzero) digits is 3732480, while the sum is 56.

The spelling of 20615891490146 in words is "twenty trillion, six hundred fifteen billion, eight hundred ninety-one million, four hundred ninety thousand, one hundred forty-six".