20461988 has 6 divisors (see below), whose sum is σ = 35808486. Its totient is φ = 10230992.

The previous prime is 20461981. The next prime is 20462003. The reversal of 20461988 is 88916402.

It can be written as a sum of positive squares in only one way, i.e., 14807104 + 5654884 = 3848^2 + 2378^2 .

It is not an unprimeable number, because it can be changed into a prime (20461981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2557745 + ... + 2557752.

It is an arithmetic number, because the mean of its divisors is an integer number (5968081).

Almost surely, 2^20461988 is an apocalyptic number.

It is an amenable number.

20461988 is a deficient number, since it is larger than the sum of its proper divisors (15346498).

20461988 is a wasteful number, since it uses less digits than its factorization.

20461988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5115501 (or 5115499 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 20461988 is about 4523.4928981927. The cubic root of 20461988 is about 273.5159193833.

The spelling of 20461988 in words is "twenty million, four hundred sixty-one thousand, nine hundred eighty-eight".