20569642020 has 36 divisors (see below), whose sum is σ = 62394581340. Its totient is φ = 5485237824.

The previous prime is 20569642019. The next prime is 20569642021. The reversal of 20569642020 is 2024696502.

20569642020 is a `hidden beast` number, since 2 + 0 + 5 + 6 + 9 + 642 + 0 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20569642019) and next prime (20569642021).

It can be written as a sum of positive squares in 2 ways, for example, as 2195297316 + 18374344704 = 46854^2 + 135552^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20569642020² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (20569642021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57137715 + ... + 57138074.

It is an arithmetic number, because the mean of its divisors is an integer number (1733182815).

Almost surely, 2^20569642020 is an apocalyptic number.

20569642020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20569642020 is an abundant number, since it is smaller than the sum of its proper divisors (41824939320).

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

20569642020 is a wasteful number, since it uses less digits than its factorization.

20569642020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114275804 (or 114275799 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 20569642020 in words is "twenty billion, five hundred sixty-nine million, six hundred forty-two thousand, twenty".