19987954 has 16 divisors (see below), whose sum is σ = 36281088. Its totient is φ = 8062272.

The previous prime is 19987949. The next prime is 19987969. The reversal of 19987954 is 45978991.

It is a super-2 number, since 2×19987954² = 799036610212232, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41754 + ... + 42229.

It is an arithmetic number, because the mean of its divisors is an integer number (2267568).

Almost surely, 2^19987954 is an apocalyptic number.

19987954 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19987954 is a deficient number, since it is larger than the sum of its proper divisors (16293134).

19987954 is a wasteful number, since it uses less digits than its factorization.

19987954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84009.

The product of its digits is 816480, while the sum is 52.

The square root of 19987954 is about 4470.7889684037. The cubic root of 19987954 is about 271.3872542571.

The spelling of 19987954 in words is "nineteen million, nine hundred eighty-seven thousand, nine hundred fifty-four".