20861445387 has 16 divisors (see below), whose sum is σ = 27910379520. Its totient is φ = 13860118272.

The previous prime is 20861445379. The next prime is 20861445461. The reversal of 20861445387 is 78354416802.

It is not a de Polignac number, because 20861445387 - 2³ = 20861445379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20861445347) by changing a digit.

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, 2205414 + ... + 2214852.

It is an arithmetic number, because the mean of its divisors is an integer number (1744398720).

Almost surely, 2^20861445387 is an apocalyptic number.

20861445387 is a deficient number, since it is larger than the sum of its proper divisors (7048934133).

20861445387 is a wasteful number, since it uses less digits than its factorization.

20861445387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11882.

The product of its (nonzero) digits is 1290240, while the sum is 48.

The spelling of 20861445387 in words is "twenty billion, eight hundred sixty-one million, four hundred forty-five thousand, three hundred eighty-seven".