20865486550 has 24 divisors (see below), whose sum is σ = 38813694336. Its totient is φ = 8345358240.

The previous prime is 20865486533. The next prime is 20865486599. The reversal of 20865486550 is 5568456802.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20865486494 and 20865486503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 809664 + ... + 835036.

It is an arithmetic number, because the mean of its divisors is an integer number (1617237264).

Almost surely, 2^20865486550 is an apocalyptic number.

20865486550 is a deficient number, since it is larger than the sum of its proper divisors (17948207786).

20865486550 is a wasteful number, since it uses less digits than its factorization.

20865486550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41832 (or 41827 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 49.

The spelling of 20865486550 in words is "twenty billion, eight hundred sixty-five million, four hundred eighty-six thousand, five hundred fifty".