20451345222 has 96 divisors (see below), whose sum is σ = 52086698496. Its totient is φ = 5239175040.

The previous prime is 20451345217. The next prime is 20451345223. The reversal of 20451345222 is 22254315402.

It is a self number, because there is not a number n which added to its sum of digits gives 20451345222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451345223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 343423 + ... + 398549.

It is an arithmetic number, because the mean of its divisors is an integer number (542569776).

Almost surely, 2^20451345222 is an apocalyptic number.

20451345222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20451345222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26043349248).

20451345222 is an abundant number, since it is smaller than the sum of its proper divisors (31635353274).

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

20451345222 is a wasteful number, since it uses less digits than its factorization.

20451345222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55234 (or 55223 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 20451345222 in words is "twenty billion, four hundred fifty-one million, three hundred forty-five thousand, two hundred twenty-two".