20860684387 has 4 divisors (see below), whose sum is σ = 20866927840. Its totient is φ = 20854440936.

The previous prime is 20860684381. The next prime is 20860684409. The reversal of 20860684387 is 78348606802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78348606802 = 2 ⋅39174303401.

It is a cyclic number.

It is not a de Polignac number, because 20860684387 - 2³ = 20860684379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20860684381) 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 3 ways as a sum of consecutive naturals, for example, 3116712 + ... + 3123397.

It is an arithmetic number, because the mean of its divisors is an integer number (5216731960).

Almost surely, 2^20860684387 is an apocalyptic number.

20860684387 is a deficient number, since it is larger than the sum of its proper divisors (6243453).

20860684387 is an equidigital number, since it uses as much as digits as its factorization.

20860684387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6243452.

The product of its (nonzero) digits is 3096576, while the sum is 52.

The spelling of 20860684387 in words is "twenty billion, eight hundred sixty million, six hundred eighty-four thousand, three hundred eighty-seven".