20865736900 has 18 divisors (see below), whose sum is σ = 45278649290. Its totient is φ = 8346294720.

The previous prime is 20865736849. The next prime is 20865736951. The reversal of 20865736900 is 963756802.

It is an interprime number because it is at equal distance from previous prime (20865736849) and next prime (20865736951).

It can be written as a sum of positive squares in 3 ways, for example, as 6852859524 + 14012877376 = 82782^2 + 118376^2 .

It is a super-2 number, since 2×20865736900² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 104328585 + ... + 104328784.

Almost surely, 2^20865736900 is an apocalyptic number.

20865736900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20865736900 is an abundant number, since it is smaller than the sum of its proper divisors (24412912390).

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

20865736900 is a wasteful number, since it uses less digits than its factorization.

20865736900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208657383 (or 208657376 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 20865736900 in words is "twenty billion, eight hundred sixty-five million, seven hundred thirty-six thousand, nine hundred".