55220431 has 8 divisors (see below), whose sum is σ = 63154080. Its totient is φ = 47298048.

The previous prime is 55220419. The next prime is 55220491. The reversal of 55220431 is 13402255.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55220431 - 2¹³ = 55212239 is a prime.

It is a super-2 number, since 2×55220431² = 6098591999651522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55220491) 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, 17115 + ... + 20083.

It is an arithmetic number, because the mean of its divisors is an integer number (7894260).

Almost surely, 2^55220431 is an apocalyptic number.

55220431 is a deficient number, since it is larger than the sum of its proper divisors (7933649).

55220431 is a wasteful number, since it uses less digits than its factorization.

55220431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5633.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 55220431 is about 7431.0450812789. The cubic root of 55220431 is about 380.8026225567.

Adding to 55220431 its reverse (13402255), we get a palindrome (68622686).

The spelling of 55220431 in words is "fifty-five million, two hundred twenty thousand, four hundred thirty-one".