1220477920 has 48 divisors (see below), whose sum is σ = 3035143440. Its totient is φ = 462495744.

The previous prime is 1220477897. The next prime is 1220478013. The reversal of 1220477920 is 297740221.

It is a happy number.

It is a super-3 number, since 3×1220477920³ (a number of 28 digits) contains 333 as substring.

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, 197697 + ... + 203776.

It is an arithmetic number, because the mean of its divisors is an integer number (63232155).

Almost surely, 2^1220477920 is an apocalyptic number.

1220477920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220477920 is an abundant number, since it is smaller than the sum of its proper divisors (1814665520).

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

1220477920 is a wasteful number, since it uses less digits than its factorization.

1220477920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401507 (or 401499 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 1220477920 is about 34935.3391281665. The cubic root of 1220477920 is about 1068.6692397281.

The spelling of 1220477920 in words is "one billion, two hundred twenty million, four hundred seventy-seven thousand, nine hundred twenty".