20318297220 has 288 divisors, whose sum is σ = 68556039552. Its totient is φ = 4839174144.

The previous prime is 20318297213. The next prime is 20318297249. The reversal of 20318297220 is 2279281302.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 11369167 + ... + 11370953.

It is an arithmetic number, because the mean of its divisors is an integer number (238041804).

Almost surely, 2^20318297220 is an apocalyptic number.

20318297220 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 20318297220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34278019776).

20318297220 is an abundant number, since it is smaller than the sum of its proper divisors (48237742332).

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

20318297220 is a wasteful number, since it uses less digits than its factorization.

20318297220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971 (or 1966 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 20318297220 in words is "twenty billion, three hundred eighteen million, two hundred ninety-seven thousand, two hundred twenty".