20136432640770 has 128 divisors (see below), whose sum is σ = 55306456128000. Its totient is φ = 5209616860416.

The previous prime is 20136432640763. The next prime is 20136432640777. The reversal of 20136432640770 is 7704623463102.

20136432640770 is a `hidden beast` number, since 2 + 0 + 136 + 43 + 2 + 6 + 407 + 70 = 666.

It is an interprime number because it is at equal distance from previous prime (20136432640763) and next prime (20136432640777).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (20136432640777) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 598747 + ... + 6374273.

It is an arithmetic number, because the mean of its divisors is an integer number (432081688500).

Almost surely, 2^{20136432640770} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20136432640770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27653228064000).

20136432640770 is an abundant number, since it is smaller than the sum of its proper divisors (35170023487230).

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

20136432640770 is a wasteful number, since it uses less digits than its factorization.

20136432640770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5775929 (or 5775923 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 45.

The spelling of 20136432640770 in words is "twenty trillion, one hundred thirty-six billion, four hundred thirty-two million, six hundred forty thousand, seven hundred seventy".