20139299569 has 9 divisors (see below), whose sum is σ = 20272577689. Its totient is φ = 20006894740.

The previous prime is 20139299567. The next prime is 20139299581. The reversal of 20139299569 is 96599293102.

The square root of 20139299569 is 141913.

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

It is not a de Polignac number, because 20139299569 - 2¹ = 20139299567 is a prime.

It is a super-2 number, since 2×20139299569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20139299567) 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, 27105012 + ... + 27105754.

Almost surely, 2^20139299569 is an apocalyptic number.

20139299569 is the 141913-rd square number.

20139299569 is the 70957-th centered octagonal number.

It is an amenable number.

20139299569 is a deficient number, since it is larger than the sum of its proper divisors (133278120).

20139299569 is an frugal number, since it uses more digits than its factorization.

20139299569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 2361960, while the sum is 55.

The spelling of 20139299569 in words is "twenty billion, one hundred thirty-nine million, two hundred ninety-nine thousand, five hundred sixty-nine".