20545347617228 has 48 divisors (see below), whose sum is σ = 42048594787584. Its totient is φ = 8599907211840.

The previous prime is 20545347617219. The next prime is 20545347617237. The reversal of 20545347617228 is 82271674354502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20545347617219) and next prime (20545347617237).

It is a super-2 number, since 2×20545347617228² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21981143 + ... + 22896753.

It is an arithmetic number, because the mean of its divisors is an integer number (876012391408).

Almost surely, 2^{20545347617228} is an apocalyptic number.

20545347617228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20545347617228 is an abundant number, since it is smaller than the sum of its proper divisors (21503247170356).

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

20545347617228 is a wasteful number, since it uses less digits than its factorization.

20545347617228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934302 (or 934300 counting only the distinct ones).

The product of its (nonzero) digits is 22579200, while the sum is 56.

The spelling of 20545347617228 in words is "twenty trillion, five hundred forty-five billion, three hundred forty-seven million, six hundred seventeen thousand, two hundred twenty-eight".