20018563820 has 48 divisors (see below), whose sum is σ = 43880755968. Its totient is φ = 7656834240.

The previous prime is 20018563819. The next prime is 20018563861. The reversal of 20018563820 is 2836581002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2197475 + ... + 2206565.

It is an arithmetic number, because the mean of its divisors is an integer number (914182416).

Almost surely, 2^20018563820 is an apocalyptic number.

20018563820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20018563820 is an abundant number, since it is smaller than the sum of its proper divisors (23862192148).

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

20018563820 is a wasteful number, since it uses less digits than its factorization.

20018563820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13910 (or 13908 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 20018563820 in words is "twenty billion, eighteen million, five hundred sixty-three thousand, eight hundred twenty".