20375564049 has 9 divisors (see below), whose sum is σ = 29431988859. Its totient is φ = 13583423880.

The previous prime is 20375563991. The next prime is 20375564051. The reversal of 20375564049 is 94046557302.

The square root of 20375564049 is 142743.

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

20375564049 is a `hidden beast` number, since 20 + 37 + 556 + 4 + 0 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14849128449 + 5526435600 = 121857^2 + 74340^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 20375564049 - 2¹¹ = 20375562001 is a prime.

It is a super-2 number, since 2×20375564049² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20375563995 and 20375564013.

It is not an unprimeable number, because it can be changed into a prime (20375564059) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 404439 + ... + 452019.

Almost surely, 2^20375564049 is an apocalyptic number.

20375564049 is the 142743-rd square number.

20375564049 is the 71372-nd centered octagonal number.

It is an amenable number.

20375564049 is a deficient number, since it is larger than the sum of its proper divisors (9056424810).

20375564049 is an frugal number, since it uses more digits than its factorization.

20375564049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95168 (or 47584 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The spelling of 20375564049 in words is "twenty billion, three hundred seventy-five million, five hundred sixty-four thousand, forty-nine".