20198732405 has 6 divisors (see below), whose sum is σ = 24238860246. Its totient is φ = 16158731688.

The previous prime is 20198732387. The next prime is 20198732413. The reversal of 20198732405 is 50423789102.

It can be written as a sum of positive squares in only one way, i.e., 16158985924 + 4039746481 = 127118^2 + 63559^2 .

It is not a de Polignac number, because 20198732405 - 2⁸ = 20198732149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 286016 + ... + 349574.

It is an arithmetic number, because the mean of its divisors is an integer number (4039810041).

Almost surely, 2^20198732405 is an apocalyptic number.

It is an amenable number.

20198732405 is a deficient number, since it is larger than the sum of its proper divisors (4040127841).

20198732405 is an frugal number, since it uses more digits than its factorization.

20198732405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127123 (or 63564 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 20198732405 in words is "twenty billion, one hundred ninety-eight million, seven hundred thirty-two thousand, four hundred five".