20185757436 has 24 divisors (see below), whose sum is σ = 50723185744. Its totient is φ = 6211002240.

The previous prime is 20185757419. The next prime is 20185757441. The reversal of 20185757436 is 63475758102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64697785 + ... + 64698096.

Almost surely, 2^20185757436 is an apocalyptic number.

20185757436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20185757436 is an abundant number, since it is smaller than the sum of its proper divisors (30537428308).

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

20185757436 is a wasteful number, since it uses less digits than its factorization.

20185757436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129395901 (or 129395899 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 48.

The spelling of 20185757436 in words is "twenty billion, one hundred eighty-five million, seven hundred fifty-seven thousand, four hundred thirty-six".