20551755 has 16 divisors (see below), whose sum is σ = 37580544. Its totient is φ = 9395040.

The previous prime is 20551733. The next prime is 20551789. The reversal of 20551755 is 55715502.

It is not a de Polignac number, because 20551755 - 2¹¹ = 20549707 is a prime.

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, 97761 + ... + 97970.

It is an arithmetic number, because the mean of its divisors is an integer number (2348784).

Almost surely, 2^20551755 is an apocalyptic number.

20551755 is a deficient number, since it is larger than the sum of its proper divisors (17028789).

20551755 is a wasteful number, since it uses less digits than its factorization.

20551755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195746.

The product of its (nonzero) digits is 8750, while the sum is 30.

The square root of 20551755 is about 4533.4043499339. The cubic root of 20551755 is about 273.9153085082.

It can be divided in two parts, 20 and 551755, that added together give a triangular number (551775 = T₁₀₅₀).

The spelling of 20551755 in words is "twenty million, five hundred fifty-one thousand, seven hundred fifty-five".