20866786320 has 40 divisors (see below), whose sum is σ = 64687038336. Its totient is φ = 5564476288.

The previous prime is 20866786307. The next prime is 20866786387. The reversal of 20866786320 is 2368766802.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20866786320.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43472232 + ... + 43472711.

Almost surely, 2^20866786320 is an apocalyptic number.

20866786320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20866786320 is an abundant number, since it is smaller than the sum of its proper divisors (43820252016).

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

20866786320 is a wasteful number, since it uses less digits than its factorization.

20866786320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86944959 (or 86944953 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 20866786320 in words is "twenty billion, eight hundred sixty-six million, seven hundred eighty-six thousand, three hundred twenty".