1220920 has 32 divisors (see below), whose sum is σ = 2779920. Its totient is φ = 482560.

The previous prime is 1220917. The next prime is 1220927. The reversal of 1220920 is 290221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1220894 and 1220903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5124 + ... + 5356.

2^1220920 is an apocalyptic number.

1220920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220920 is an abundant number, since it is smaller than the sum of its proper divisors (1559000).

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

1220920 is a wasteful number, since it uses less digits than its factorization.

1220920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1220920 is about 1104.9524876663. The cubic root of 1220920 is about 106.8798254835.

The spelling of 1220920 in words is "one million, two hundred twenty thousand, nine hundred twenty".