20553699 has 16 divisors (see below), whose sum is σ = 28271232. Its totient is φ = 13274688.

The previous prime is 20553691. The next prime is 20553703. The reversal of 20553699 is 99635502.

It is not a de Polignac number, because 20553699 - 2³ = 20553691 is a prime.

20553699 is a modest number, since divided by 3699 gives 2055 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20553691) 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, 17092 + ... + 18254.

It is an arithmetic number, because the mean of its divisors is an integer number (1766952).

Almost surely, 2^20553699 is an apocalyptic number.

20553699 is a deficient number, since it is larger than the sum of its proper divisors (7717533).

20553699 is a wasteful number, since it uses less digits than its factorization.

20553699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346.

The product of its (nonzero) digits is 72900, while the sum is 39.

The square root of 20553699 is about 4533.6187532698. The cubic root of 20553699 is about 273.9239448278.

It can be divided in two parts, 2055369 and 9, that added together give a triangular number (2055378 = T₂₀₂₇).

The spelling of 20553699 in words is "twenty million, five hundred fifty-three thousand, six hundred ninety-nine".