1918020550 has 48 divisors (see below), whose sum is σ = 3782949840. Its totient is φ = 721474560.

The previous prime is 1918020527. The next prime is 1918020581. The reversal of 1918020550 is 550208191.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122782 + ... + 137518.

It is an arithmetic number, because the mean of its divisors is an integer number (78811455).

Almost surely, 2^1918020550 is an apocalyptic number.

1918020550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1918020550 is a deficient number, since it is larger than the sum of its proper divisors (1864929290).

1918020550 is a wasteful number, since it uses less digits than its factorization.

1918020550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14905 (or 14900 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 1918020550 is about 43795.2114962355. The cubic root of 1918020550 is about 1242.4657297232.

The spelling of 1918020550 in words is "one billion, nine hundred eighteen million, twenty thousand, five hundred fifty".