20403055 has 16 divisors (see below), whose sum is σ = 25895520. Its totient is φ = 15389568.

The previous prime is 20403023. The next prime is 20403073. The reversal of 20403055 is 55030402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20403055 - 2⁵ = 20403023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27469 + ... + 28201.

It is an arithmetic number, because the mean of its divisors is an integer number (1618470).

Almost surely, 2^20403055 is an apocalyptic number.

20403055 is a deficient number, since it is larger than the sum of its proper divisors (5492465).

20403055 is a wasteful number, since it uses less digits than its factorization.

20403055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 20403055 is about 4516.9740977783. The cubic root of 20403055 is about 273.2530805772.

20403055 divided by its sum of digits (19) gives a triangular number (1073845 = T₁₄₆₅).

Adding to 20403055 its reverse (55030402), we get a palindrome (75433457).

The spelling of 20403055 in words is "twenty million, four hundred three thousand, fifty-five".