20742550164 has 72 divisors (see below), whose sum is σ = 59945016768. Its totient is φ = 5924257920.

The previous prime is 20742550133. The next prime is 20742550177. The reversal of 20742550164 is 46105524702.

It is a happy number.

20742550164 is a `hidden beast` number, since 2 + 0 + 7 + 42 + 550 + 1 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 745104 + ... + 772440.

Almost surely, 2^20742550164 is an apocalyptic number.

It is an amenable number.

20742550164 is an abundant number, since it is smaller than the sum of its proper divisors (39202466604).

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

20742550164 is a wasteful number, since it uses less digits than its factorization.

20742550164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30365 (or 30360 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The spelling of 20742550164 in words is "twenty billion, seven hundred forty-two million, five hundred fifty thousand, one hundred sixty-four".