20898460969 has 3 divisors (see below), whose sum is σ = 20898605533. Its totient is φ = 20898316406.

The previous prime is 20898460861. The next prime is 20898461009. The reversal of 20898460969 is 96906489802.

The square root of 20898460969 is 144563.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 20898460969 - 2²⁹ = 20361590057 is a prime.

It is a super-2 number, since 2×20898460969² (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 (20898460769) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 72282 + ... + 216844.

Almost surely, 2^20898460969 is an apocalyptic number.

20898460969 is the 144563-rd square number.

20898460969 is the 72282-nd centered octagonal number.

It is an amenable number.

20898460969 is a deficient number, since it is larger than the sum of its proper divisors (144564).

20898460969 is an frugal number, since it uses more digits than its factorization.

20898460969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289126 (or 144563 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 61.

The spelling of 20898460969 in words is "twenty billion, eight hundred ninety-eight million, four hundred sixty thousand, nine hundred sixty-nine".