20709670464 has 560 divisors, whose sum is σ = 75482704000. Its totient is φ = 5596480512.

The previous prime is 20709670463. The next prime is 20709670469. The reversal of 20709670464 is 46407690702.

It is not an unprimeable number, because it can be changed into a prime (20709670463) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 33783822 + ... + 33784434.

Almost surely, 2^20709670464 is an apocalyptic number.

20709670464 is a gapful number since it is divisible by the number (24) 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 20709670464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37741352000).

20709670464 is an abundant number, since it is smaller than the sum of its proper divisors (54773033536).

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

20709670464 is an equidigital number, since it uses as much as digits as its factorization.

20709670464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 20709670464 in words is "twenty billion, seven hundred nine million, six hundred seventy thousand, four hundred sixty-four".