20145554220 has 96 divisors (see below), whose sum is σ = 61565495040. Its totient is φ = 4881391360.

The previous prime is 20145554201. The next prime is 20145554239. The reversal of 20145554220 is 2245554102.

It is an interprime number because it is at equal distance from previous prime (20145554201) and next prime (20145554239).

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 1616734 + ... + 1629146.

It is an arithmetic number, because the mean of its divisors is an integer number (641307240).

Almost surely, 2^20145554220 is an apocalyptic number.

20145554220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20145554220 is an abundant number, since it is smaller than the sum of its proper divisors (41419940820).

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

20145554220 is a wasteful number, since it uses less digits than its factorization.

20145554220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14895 (or 14893 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

The spelling of 20145554220 in words is "twenty billion, one hundred forty-five million, five hundred fifty-four thousand, two hundred twenty".