20581478370 has 24 divisors (see below), whose sum is σ = 53511843996. Its totient is φ = 5488394208.

The previous prime is 20581478369. The next prime is 20581478371. The reversal of 20581478370 is 7387418502.

20581478370 is a `hidden beast` number, since 20 + 581 + 47 + 8 + 3 + 7 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20581478369) and next prime (20581478371).

It can be written as a sum of positive squares in 2 ways, for example, as 16632487089 + 3948991281 = 128967^2 + 62841^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (20581478371) 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 11 ways as a sum of consecutive naturals, for example, 114341457 + ... + 114341636.

Almost surely, 2^20581478370 is an apocalyptic number.

20581478370 is an abundant number, since it is smaller than the sum of its proper divisors (32930365626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20581478370 is a wasteful number, since it uses less digits than its factorization.

20581478370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228683106 (or 228683103 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 20581478370 in words is "twenty billion, five hundred eighty-one million, four hundred seventy-eight thousand, three hundred seventy".