20734161645 has 8 divisors (see below), whose sum is σ = 33174658656. Its totient is φ = 11058219536.

The previous prime is 20734161631. The next prime is 20734161649. The reversal of 20734161645 is 54616143702.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20734161645 - 2¹¹ = 20734159597 is a prime.

It is a super-3 number, since 3×20734161645³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20734161649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691138707 + ... + 691138736.

It is an arithmetic number, because the mean of its divisors is an integer number (4146832332).

Almost surely, 2^20734161645 is an apocalyptic number.

It is an amenable number.

20734161645 is a deficient number, since it is larger than the sum of its proper divisors (12440497011).

20734161645 is a wasteful number, since it uses less digits than its factorization.

20734161645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382277451.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 20734161645 in words is "twenty billion, seven hundred thirty-four million, one hundred sixty-one thousand, six hundred forty-five".