20736458478 has 12 divisors (see below), whose sum is σ = 44928993408. Its totient is φ = 6912152820.

The previous prime is 20736458461. The next prime is 20736458549. The reversal of 20736458478 is 87485463702.

20736458478 is a `hidden beast` number, since 20 + 7 + 36 + 4 + 584 + 7 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 576012718 + ... + 576012753.

It is an arithmetic number, because the mean of its divisors is an integer number (3744082784).

Almost surely, 2^20736458478 is an apocalyptic number.

20736458478 is an abundant number, since it is smaller than the sum of its proper divisors (24192534930).

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

20736458478 is a wasteful number, since it uses less digits than its factorization.

20736458478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152025479 (or 1152025476 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 54.

The spelling of 20736458478 in words is "twenty billion, seven hundred thirty-six million, four hundred fifty-eight thousand, four hundred seventy-eight".