20501887069 has 4 divisors (see below), whose sum is σ = 21707880444. Its totient is φ = 19295893696.

The previous prime is 20501887057. The next prime is 20501887073. The reversal of 20501887069 is 96078810502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7632119044 + 12869768025 = 87362^2 + 113445^2 .

It is a cyclic number.

It is not a de Polignac number, because 20501887069 - 2¹³ = 20501878877 is a prime.

It is a super-2 number, since 2×20501887069² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20501887099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 602996662 + ... + 602996695.

It is an arithmetic number, because the mean of its divisors is an integer number (5426970111).

Almost surely, 2^20501887069 is an apocalyptic number.

It is an amenable number.

20501887069 is a deficient number, since it is larger than the sum of its proper divisors (1205993375).

20501887069 is a wasteful number, since it uses less digits than its factorization.

20501887069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205993374.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 20501887069 in words is "twenty billion, five hundred one million, eight hundred eighty-seven thousand, sixty-nine".