20631219 has 16 divisors (see below), whose sum is σ = 31603968. Its totient is φ = 11727072.

The previous prime is 20631203. The next prime is 20631229. The reversal of 20631219 is 91213602.

It is not a de Polignac number, because 20631219 - 2⁴ = 20631203 is a prime.

It is a super-2 number, since 2×20631219² = 851294394851922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20631229) 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, 1644 + ... + 6630.

It is an arithmetic number, because the mean of its divisors is an integer number (1975248).

Almost surely, 2^20631219 is an apocalyptic number.

20631219 is a deficient number, since it is larger than the sum of its proper divisors (10972749).

20631219 is a wasteful number, since it uses less digits than its factorization.

20631219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5194.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20631219 is about 4542.1601689064. The cubic root of 20631219 is about 274.2678884977.

The spelling of 20631219 in words is "twenty million, six hundred thirty-one thousand, two hundred nineteen".