1220839620 has 192 divisors, whose sum is σ = 4589899776. Its totient is φ = 234155520.

The previous prime is 1220839601. The next prime is 1220839637. The reversal of 1220839620 is 269380221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 49897 + ... + 70223.

It is an arithmetic number, because the mean of its divisors is an integer number (23905728).

Almost surely, 2^1220839620 is an apocalyptic number.

1220839620 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 1220839620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2294949888).

1220839620 is an abundant number, since it is smaller than the sum of its proper divisors (3369060156).

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

1220839620 is a wasteful number, since it uses less digits than its factorization.

1220839620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20370 (or 20368 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1220839620 is about 34940.5154512637. The cubic root of 1220839620 is about 1068.7747993288.

The spelling of 1220839620 in words is "one billion, two hundred twenty million, eight hundred thirty-nine thousand, six hundred twenty".