1542220220 has 12 divisors (see below), whose sum is σ = 3238662504. Its totient is φ = 616888080.

The previous prime is 1542220187. The next prime is 1542220237. The reversal of 1542220220 is 220222451.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 77111011 = 1542220220 / (1 + 5 + 4 + 2 + 2 + 2 + 0 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1542220192 and 1542220201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38555486 + ... + 38555525.

It is an arithmetic number, because the mean of its divisors is an integer number (269888542).

Almost surely, 2^1542220220 is an apocalyptic number.

1542220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1542220220 is an abundant number, since it is smaller than the sum of its proper divisors (1696442284).

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

1542220220 is a wasteful number, since it uses less digits than its factorization.

1542220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77111020 (or 77111018 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 1542220220 is about 39271.1117744329. Note that the first 3 decimals coincide. The cubic root of 1542220220 is about 1155.3550428648.

Adding to 1542220220 its reverse (220222451), we get a palindrome (1762442671).

The spelling of 1542220220 in words is "one billion, five hundred forty-two million, two hundred twenty thousand, two hundred twenty".