20357469121644 has 18 divisors (see below), whose sum is σ = 51459158057580. Its totient is φ = 6785823040536.

The previous prime is 20357469121643. The next prime is 20357469121657. The reversal of 20357469121644 is 44612196475302.

20357469121644 is a `hidden beast` number, since 2 + 0 + 3 + 5 + 7 + 469 + 12 + 164 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (20357469121643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 282742626654 + ... + 282742626725.

It is an arithmetic number, because the mean of its divisors is an integer number (2858842114310).

Almost surely, 2^{20357469121644} is an apocalyptic number.

It is an amenable number.

20357469121644 is an abundant number, since it is smaller than the sum of its proper divisors (31101688935936).

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

20357469121644 is a wasteful number, since it uses less digits than its factorization.

20357469121644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565485253389 (or 565485253384 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 20357469121644 in words is "twenty trillion, three hundred fifty-seven billion, four hundred sixty-nine million, one hundred twenty-one thousand, six hundred forty-four".