1220266431 has 32 divisors (see below), whose sum is σ = 1907136000. Its totient is φ = 768999744.

The previous prime is 1220266373. The next prime is 1220266433. The reversal of 1220266431 is 1346620221.

1220266431 is a `hidden beast` number, since 1 + 220 + 2 + 6 + 6 + 431 = 666.

It is not a de Polignac number, because 1220266431 - 2⁶ = 1220266367 is a prime.

It is a super-2 number, since 2×1220266431² = 2978100325250955522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1220266395 and 1220266404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220266433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 255675 + ... + 260403.

It is an arithmetic number, because the mean of its divisors is an integer number (59598000).

Almost surely, 2^1220266431 is an apocalyptic number.

1220266431 is a deficient number, since it is larger than the sum of its proper divisors (686869569).

1220266431 is a wasteful number, since it uses less digits than its factorization.

1220266431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5260 (or 5254 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1220266431 is about 34932.3121336106. The cubic root of 1220266431 is about 1068.6075084885.

Adding to 1220266431 its reverse (1346620221), we get a palindrome (2566886652).

The spelling of 1220266431 in words is "one billion, two hundred twenty million, two hundred sixty-six thousand, four hundred thirty-one".