20817429047962 has 4 divisors (see below), whose sum is σ = 31226143571946. Its totient is φ = 10408714523980.

The previous prime is 20817429047903. The next prime is 20817429047971. The reversal of 20817429047962 is 26974092471802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12362122392361 + 8455306655601 = 3515981^2 + 2907801^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20817429047962.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5204357261989 + ... + 5204357261992.

Almost surely, 2^{20817429047962} is an apocalyptic number.

20817429047962 is a deficient number, since it is larger than the sum of its proper divisors (10408714523984).

20817429047962 is a wasteful number, since it uses less digits than its factorization.

20817429047962 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10408714523983.

The product of its (nonzero) digits is 24385536, while the sum is 61.

The spelling of 20817429047962 in words is "twenty trillion, eight hundred seventeen billion, four hundred twenty-nine million, forty-seven thousand, nine hundred sixty-two".