1954556820 has 144 divisors (see below), whose sum is σ = 6286146048. Its totient is φ = 490717440.

The previous prime is 1954556777. The next prime is 1954556839. The reversal of 1954556820 is 286554591.

1954556820 is a `hidden beast` number, since 1 + 95 + 4 + 556 + 8 + 2 + 0 = 666.

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 47 ways as a sum of consecutive naturals, for example, 201727 + ... + 211193.

It is an arithmetic number, because the mean of its divisors is an integer number (43653792).

Almost surely, 2^1954556820 is an apocalyptic number.

1954556820 is a gapful number since it is divisible by the number (10) 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 1954556820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3143073024).

1954556820 is an abundant number, since it is smaller than the sum of its proper divisors (4331589228).

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

1954556820 is a wasteful number, since it uses less digits than its factorization.

1954556820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9550 (or 9545 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The square root of 1954556820 is about 44210.3700504757. The cubic root of 1954556820 is about 1250.3053803215.

The spelling of 1954556820 in words is "one billion, nine hundred fifty-four million, five hundred fifty-six thousand, eight hundred twenty".