20361655620 has 72 divisors (see below), whose sum is σ = 62330388120. Its totient is φ = 5379955200.

The previous prime is 20361655607. The next prime is 20361655637. The reversal of 20361655620 is 2655616302.

It is a happy number.

20361655620 is a `hidden beast` number, since 2 + 0 + 36 + 1 + 65 + 562 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1091773764 + 19269881856 = 33042^2 + 138816^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 499281 + ... + 538520.

It is an arithmetic number, because the mean of its divisors is an integer number (865699835).

Almost surely, 2^20361655620 is an apocalyptic number.

20361655620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20361655620 is an abundant number, since it is smaller than the sum of its proper divisors (41968732500).

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

20361655620 is a wasteful number, since it uses less digits than its factorization.

20361655620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037925 (or 1037920 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 20361655620 in words is "twenty billion, three hundred sixty-one million, six hundred fifty-five thousand, six hundred twenty".