20547478 has 16 divisors (see below), whose sum is σ = 36084384. Its totient is φ = 8591040.

The previous prime is 20547467. The next prime is 20547479. The reversal of 20547478 is 87474502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20547479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17325 + ... + 18472.

It is an arithmetic number, because the mean of its divisors is an integer number (2255274).

Almost surely, 2^20547478 is an apocalyptic number.

20547478 is a deficient number, since it is larger than the sum of its proper divisors (15536906).

20547478 is a wasteful number, since it uses less digits than its factorization.

20547478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35847.

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 20547478 is about 4532.9326048376. The cubic root of 20547478 is about 273.8963057993.

It can be divided in two parts, 20547 and 478, that added together give a square (21025 = 145²).

The spelling of 20547478 in words is "twenty million, five hundred forty-seven thousand, four hundred seventy-eight".