20662947396 has 360 divisors, whose sum is σ = 68982966360. Its totient is φ = 5343916032.

The previous prime is 20662947379. The next prime is 20662947401. The reversal of 20662947396 is 69374926602.

20662947396 is a `hidden beast` number, since 2 + 0 + 6 + 629 + 4 + 7 + 3 + 9 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1835265600 + 18827681796 = 42840^2 + 137214^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 10937620 + ... + 10939508.

It is an arithmetic number, because the mean of its divisors is an integer number (191619351).

Almost surely, 2^20662947396 is an apocalyptic number.

20662947396 is a gapful number since it is divisible by the number (26) 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 20662947396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34491483180).

20662947396 is an abundant number, since it is smaller than the sum of its proper divisors (48320018964).

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

20662947396 is a wasteful number, since it uses less digits than its factorization.

20662947396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985 (or 1967 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 54.

The spelling of 20662947396 in words is "twenty billion, six hundred sixty-two million, nine hundred forty-seven thousand, three hundred ninety-six".