55020405 has 16 divisors (see below), whose sum is σ = 96035904. Its totient is φ = 26676480.

The previous prime is 55020403. The next prime is 55020461. The reversal of 55020405 is 50402055.

Added to its reverse (50402055) it gives a triangular number (105422460 = T₁₄₅₂₀).

It is not a de Polignac number, because 55020405 - 2¹ = 55020403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55020403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166564 + ... + 166893.

It is an arithmetic number, because the mean of its divisors is an integer number (6002244).

Almost surely, 2^55020405 is an apocalyptic number.

55020405 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55020405 is a deficient number, since it is larger than the sum of its proper divisors (41015499).

55020405 is a wasteful number, since it uses less digits than its factorization.

55020405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333476.

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 55020405 is about 7417.5740643421. The cubic root of 55020405 is about 380.3422701067.

Adding to 55020405 its reverse (50402055), we get a triangular number (105422460 = T₁₄₅₂₀).

The spelling of 55020405 in words is "fifty-five million, twenty thousand, four hundred five".