20219912 has 8 divisors (see below), whose sum is σ = 37912350. Its totient is φ = 10109952.

The previous prime is 20219911. The next prime is 20219939. The reversal of 20219912 is 21991202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19589476 + 630436 = 4426^2 + 794^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20219911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1263737 + ... + 1263752.

Almost surely, 2^20219912 is an apocalyptic number.

It is an amenable number.

20219912 is a deficient number, since it is larger than the sum of its proper divisors (17692438).

20219912 is a wasteful number, since it uses less digits than its factorization.

20219912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527495 (or 2527491 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 20219912 is about 4496.6556461441. The cubic root of 20219912 is about 272.4330256526.

The spelling of 20219912 in words is "twenty million, two hundred nineteen thousand, nine hundred twelve".