1220426520 has 32 divisors (see below), whose sum is σ = 3661279920. Its totient is φ = 325447040.

The previous prime is 1220426513. The next prime is 1220426527. The reversal of 1220426520 is 256240221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1220426513) and next prime (1220426527).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220426527) 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, 5084991 + ... + 5085230.

Almost surely, 2^1220426520 is an apocalyptic number.

1220426520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220426520 is an abundant number, since it is smaller than the sum of its proper divisors (2440853400).

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

1220426520 is a wasteful number, since it uses less digits than its factorization.

1220426520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10170235 (or 10170231 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1220426520 is about 34934.6034756372. The cubic root of 1220426520 is about 1068.6542373073.

Adding to 1220426520 its reverse (256240221), we get a palindrome (1476666741).

The spelling of 1220426520 in words is "one billion, two hundred twenty million, four hundred twenty-six thousand, five hundred twenty".