20635336620 has 144 divisors (see below), whose sum is σ = 64751232000. Its totient is φ = 5313859200.

The previous prime is 20635336597. The next prime is 20635336639. The reversal of 20635336620 is 2663353602.

20635336620 is a `hidden beast` number, since 2 + 0 + 63 + 533 + 6 + 62 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2780715 + ... + 2788125.

Almost surely, 2^20635336620 is an apocalyptic number.

20635336620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20635336620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32375616000).

20635336620 is an abundant number, since it is smaller than the sum of its proper divisors (44115895380).

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

20635336620 is a wasteful number, since it uses less digits than its factorization.

20635336620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7956 (or 7951 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 36.

The spelling of 20635336620 in words is "twenty billion, six hundred thirty-five million, three hundred thirty-six thousand, six hundred twenty".