20817929470954 has 32 divisors (see below), whose sum is σ = 38933599965696. Its totient is φ = 8110596564720.

The previous prime is 20817929470937. The next prime is 20817929470957. The reversal of 20817929470954 is 45907492971802.

It is a self number, because there is not a number n which added to its sum of digits gives 20817929470954.

It is not an unprimeable number, because it can be changed into a prime (20817929470957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2047477 + ... + 6769639.

It is an arithmetic number, because the mean of its divisors is an integer number (1216674998928).

Almost surely, 2^{20817929470954} is an apocalyptic number.

20817929470954 is a deficient number, since it is larger than the sum of its proper divisors (18115670494742).

20817929470954 is a wasteful number, since it uses less digits than its factorization.

20817929470954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4750810.

The product of its (nonzero) digits is 91445760, while the sum is 67.

The spelling of 20817929470954 in words is "twenty trillion, eight hundred seventeen billion, nine hundred twenty-nine million, four hundred seventy thousand, nine hundred fifty-four".