20655659430 has 432 divisors, whose sum is σ = 69938603280. Its totient is φ = 4204763136.

The previous prime is 20655659399. The next prime is 20655659441. The reversal of 20655659430 is 3495655602.

20655659430 is a `hidden beast` number, since 2 + 0 + 6 + 5 + 56 + 594 + 3 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 24214884 + ... + 24215736.

It is an arithmetic number, because the mean of its divisors is an integer number (161894915).

Almost surely, 2^20655659430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20655659430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34969301640).

20655659430 is an abundant number, since it is smaller than the sum of its proper divisors (49282943850).

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

20655659430 is a wasteful number, since it uses less digits than its factorization.

20655659430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933 (or 906 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 45.

The spelling of 20655659430 in words is "twenty billion, six hundred fifty-five million, six hundred fifty-nine thousand, four hundred thirty".