20605873487 has 12 divisors (see below), whose sum is σ = 20992747680. Its totient is φ = 20225991072.

The previous prime is 20605873481. The next prime is 20605873493. The reversal of 20605873487 is 78437850602.

It is an interprime number because it is at equal distance from previous prime (20605873481) and next prime (20605873493).

It is not a de Polignac number, because 20605873487 - 2⁶ = 20605873423 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 (20605873481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2498723 + ... + 2506955.

It is an arithmetic number, because the mean of its divisors is an integer number (1749395640).

Almost surely, 2^20605873487 is an apocalyptic number.

20605873487 is a deficient number, since it is larger than the sum of its proper divisors (386874193).

20605873487 is an frugal number, since it uses more digits than its factorization.

20605873487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9070 (or 9011 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 50.

The spelling of 20605873487 in words is "twenty billion, six hundred five million, eight hundred seventy-three thousand, four hundred eighty-seven".