20858487650 has 192 divisors, whose sum is σ = 52459142400. Its totient is φ = 5958835200.

The previous prime is 20858487647. The next prime is 20858487677. The reversal of 20858487650 is 5678485802.

It is a junction number, because it is equal to n+sod(n) for n = 20858487592 and 20858487601.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7456052 + ... + 7458848.

It is an arithmetic number, because the mean of its divisors is an integer number (273224700).

Almost surely, 2^20858487650 is an apocalyptic number.

20858487650 is an abundant number, since it is smaller than the sum of its proper divisors (31600654750).

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

20858487650 is a wasteful number, since it uses less digits than its factorization.

20858487650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2989 (or 2984 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 53.

The spelling of 20858487650 in words is "twenty billion, eight hundred fifty-eight million, four hundred eighty-seven thousand, six hundred fifty".