20945473587 has 16 divisors (see below), whose sum is σ = 31078615680. Its totient is φ = 13941921096.

The previous prime is 20945473579. The next prime is 20945473607. The reversal of 20945473587 is 78537454902.

It is a happy number.

20945473587 is a `hidden beast` number, since 2 + 0 + 9 + 4 + 54 + 7 + 3 + 587 = 666.

It is not a de Polignac number, because 20945473587 - 2³ = 20945473579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20945473567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 585873 + ... + 620594.

It is an arithmetic number, because the mean of its divisors is an integer number (1942413480).

Almost surely, 2^20945473587 is an apocalyptic number.

20945473587 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20945473587 is a deficient number, since it is larger than the sum of its proper divisors (10133142093).

20945473587 is a wasteful number, since it uses less digits than its factorization.

20945473587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207119 (or 1207113 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 54.

The spelling of 20945473587 in words is "twenty billion, nine hundred forty-five million, four hundred seventy-three thousand, five hundred eighty-seven".