20836157447 has 24 divisors (see below), whose sum is σ = 25485052032. Its totient is φ = 16952535600.

The previous prime is 20836157437. The next prime is 20836157479. The reversal of 20836157447 is 74475163802.

It is not a de Polignac number, because 20836157447 - 2⁴ = 20836157431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20836157417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77072 + ... + 218202.

It is an arithmetic number, because the mean of its divisors is an integer number (1061877168).

Almost surely, 2^20836157447 is an apocalyptic number.

20836157447 is a deficient number, since it is larger than the sum of its proper divisors (4648894585).

20836157447 is a wasteful number, since it uses less digits than its factorization.

20836157447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141299 (or 141292 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 47.

The spelling of 20836157447 in words is "twenty billion, eight hundred thirty-six million, one hundred fifty-seven thousand, four hundred forty-seven".