1220420334 has 16 divisors (see below), whose sum is σ = 2789532288. Its totient is φ = 348691512.

The previous prime is 1220420329. The next prime is 1220420363. The reversal of 1220420334 is 4330240221.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1220420334.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14528772 + ... + 14528855.

It is an arithmetic number, because the mean of its divisors is an integer number (174345768).

Almost surely, 2^1220420334 is an apocalyptic number.

1220420334 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1220420334 is an abundant number, since it is smaller than the sum of its proper divisors (1569111954).

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

1220420334 is a wasteful number, since it uses less digits than its factorization.

1220420334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29057639.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 1220420334 is about 34934.5149386677. The cubic root of 1220420334 is about 1068.6524317346.

Adding to 1220420334 its reverse (4330240221), we get a palindrome (5550660555).

The spelling of 1220420334 in words is "one billion, two hundred twenty million, four hundred twenty thousand, three hundred thirty-four".