20257606340 has 24 divisors (see below), whose sum is σ = 43262009280. Its totient is φ = 7965702368.

The previous prime is 20257606309. The next prime is 20257606387. The reversal of 20257606340 is 4360675202.

It is a super-2 number, since 2×20257606340² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20257606340.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8582552 + ... + 8584911.

It is an arithmetic number, because the mean of its divisors is an integer number (1802583720).

Almost surely, 2^20257606340 is an apocalyptic number.

20257606340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20257606340 is an abundant number, since it is smaller than the sum of its proper divisors (23004402940).

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

20257606340 is a wasteful number, since it uses less digits than its factorization.

20257606340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17167531 (or 17167529 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 35.

The spelling of 20257606340 in words is "twenty billion, two hundred fifty-seven million, six hundred six thousand, three hundred forty".