20356478356 has 12 divisors (see below), whose sum is σ = 35626675168. Its totient is φ = 10177428312.

The previous prime is 20356478347. The next prime is 20356478369. The reversal of 20356478356 is 65387465302.

It is a super-2 number, since 2×20356478356² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144366 + ... + 248101.

Almost surely, 2^20356478356 is an apocalyptic number.

It is an amenable number.

20356478356 is a deficient number, since it is larger than the sum of its proper divisors (15270196812).

20356478356 is a wasteful number, since it uses less digits than its factorization.

20356478356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405438 (or 405436 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 20356478356 in words is "twenty billion, three hundred fifty-six million, four hundred seventy-eight thousand, three hundred fifty-six".