20447478478 has 16 divisors (see below), whose sum is σ = 35056157184. Its totient is φ = 8762370840.

The previous prime is 20447478419. The next prime is 20447478487. The reversal of 20447478478 is 87487474402.

It is a super-2 number, since 2×20447478478² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96463 + ... + 224053.

It is an arithmetic number, because the mean of its divisors is an integer number (2191009824).

Almost surely, 2^20447478478 is an apocalyptic number.

20447478478 is a deficient number, since it is larger than the sum of its proper divisors (14608678706).

20447478478 is a wasteful number, since it uses less digits than its factorization.

20447478478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139047.

The product of its (nonzero) digits is 11239424, while the sum is 55.

The spelling of 20447478478 in words is "twenty billion, four hundred forty-seven million, four hundred seventy-eight thousand, four hundred seventy-eight".