20185197926436 has 135 divisors (see below), whose sum is σ = 54233569016263. Its totient is φ = 6330167034240.

The previous prime is 20185197926431. The next prime is 20185197926441. The reversal of 20185197926436 is 63462979158102.

The square root of 20185197926436 is 4492794.

It is a perfect power (a square), and thus also a powerful number.

20185197926436 is a `hidden beast` number, since 2 + 0 + 1 + 8 + 5 + 197 + 9 + 2 + 6 + 436 = 666.

It is an interprime number because it is at equal distance from previous prime (20185197926431) and next prime (20185197926441).

It can be written as a sum of positive squares in 2 ways, for example, as 6264538444836 + 13920659481600 = 2502906^2 + 3731040^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20185197926431) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 7790503501 + ... + 7790506091.

It is a 1-persistent number, because it is pandigital, but 2⋅20185197926436 = 40370395852872 is not.

Almost surely, 2^{20185197926436} is an apocalyptic number.

20185197926436 is the 4492794-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20185197926436

20185197926436 is an abundant number, since it is smaller than the sum of its proper divisors (34048371089827).

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

20185197926436 is an frugal number, since it uses more digits than its factorization.

20185197926436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5260 (or 2613 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 63.

The spelling of 20185197926436 in words is "twenty trillion, one hundred eighty-five billion, one hundred ninety-seven million, nine hundred twenty-six thousand, four hundred thirty-six".