20345870649 has 8 divisors (see below), whose sum is σ = 29214583552. Its totient is φ = 12520535760.

The previous prime is 20345870609. The next prime is 20345870659. The reversal of 20345870649 is 94607854302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20345870649 - 2¹⁶ = 20345805113 is a prime.

It is a super-3 number, since 3×20345870649³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20345870598 and 20345870607.

It is not an unprimeable number, because it can be changed into a prime (20345870609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260844457 + ... + 260844534.

It is an arithmetic number, because the mean of its divisors is an integer number (3651822944).

Almost surely, 2^20345870649 is an apocalyptic number.

It is an amenable number.

20345870649 is a deficient number, since it is larger than the sum of its proper divisors (8868712903).

20345870649 is a wasteful number, since it uses less digits than its factorization.

20345870649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521689007.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 20345870649 in words is "twenty billion, three hundred forty-five million, eight hundred seventy thousand, six hundred forty-nine".