20547406236 has 144 divisors (see below), whose sum is σ = 56862516480. Its totient is φ = 5656780800.

The previous prime is 20547406181. The next prime is 20547406277. The reversal of 20547406236 is 63260474502.

It is a junction number, because it is equal to n+sod(n) for n = 20547406194 and 20547406203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26719260 + ... + 26720028.

Almost surely, 2^20547406236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20547406236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28431258240).

20547406236 is an abundant number, since it is smaller than the sum of its proper divisors (36315110244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20547406236 is a wasteful number, since it uses less digits than its factorization.

20547406236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176 (or 1143 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 39.

The spelling of 20547406236 in words is "twenty billion, five hundred forty-seven million, four hundred six thousand, two hundred thirty-six".