20669245340 has 24 divisors (see below), whose sum is σ = 43408462272. Its totient is φ = 8267117760.

The previous prime is 20669245327. The next prime is 20669245349. The reversal of 20669245340 is 4354296602.

It is a super-2 number, since 2×20669245340² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20669245349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362882 + ... + 415958.

It is an arithmetic number, because the mean of its divisors is an integer number (1808685928).

Almost surely, 2^20669245340 is an apocalyptic number.

20669245340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20669245340 is an abundant number, since it is smaller than the sum of its proper divisors (22739216932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20669245340 is a wasteful number, since it uses less digits than its factorization.

20669245340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72557 (or 72555 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 20669245340 in words is "twenty billion, six hundred sixty-nine million, two hundred forty-five thousand, three hundred forty".