1994051220 has 48 divisors (see below), whose sum is σ = 6380965248. Its totient is φ = 455783040.

The previous prime is 1994051219. The next prime is 1994051221. The reversal of 1994051220 is 221504991.

It is an interprime number because it is at equal distance from previous prime (1994051219) and next prime (1994051221).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994051221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2373451 + ... + 2374290.

It is an arithmetic number, because the mean of its divisors is an integer number (132936776).

Almost surely, 2^1994051220 is an apocalyptic number.

1994051220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1994051220 is an abundant number, since it is smaller than the sum of its proper divisors (4386914028).

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

1994051220 is a wasteful number, since it uses less digits than its factorization.

1994051220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4747760 (or 4747758 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1994051220 is about 44654.8006377814. The cubic root of 1994051220 is about 1258.6706438186.

The spelling of 1994051220 in words is "one billion, nine hundred ninety-four million, fifty-one thousand, two hundred twenty".