20218867920 has 160 divisors (see below), whose sum is σ = 71341683840. Its totient is φ = 5260170240.

The previous prime is 20218867901. The next prime is 20218867951. The reversal of 20218867920 is 2976881202.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25594 + ... + 202713.

It is an arithmetic number, because the mean of its divisors is an integer number (445885524).

Almost surely, 2^20218867920 is an apocalyptic number.

20218867920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20218867920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35670841920).

20218867920 is an abundant number, since it is smaller than the sum of its proper divisors (51122815920).

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

20218867920 is a wasteful number, since it uses less digits than its factorization.

20218867920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228370 (or 228358 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 20218867920 in words is "twenty billion, two hundred eighteen million, eight hundred sixty-seven thousand, nine hundred twenty".