20219487 has 16 divisors (see below), whose sum is σ = 27566688. Its totient is φ = 13178880.

The previous prime is 20219483. The next prime is 20219491. The reversal of 20219487 is 78491202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20219483) and next prime (20219491).

It is not a de Polignac number, because 20219487 - 2² = 20219483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20219483) 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 15 ways as a sum of consecutive naturals, for example, 57103 + ... + 57455.

It is an arithmetic number, because the mean of its divisors is an integer number (1722918).

Almost surely, 2^20219487 is an apocalyptic number.

20219487 is a deficient number, since it is larger than the sum of its proper divisors (7347201).

20219487 is a wasteful number, since it uses less digits than its factorization.

20219487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 20219487 is about 4496.6083885524. The cubic root of 20219487 is about 272.4311168931.

It can be divided in two parts, 20219 and 487, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 20219487 in words is "twenty million, two hundred nineteen thousand, four hundred eighty-seven".