20400498 has 20 divisors (see below), whose sum is σ = 45712590. Its totient is φ = 6800112.

The previous prime is 20400481. The next prime is 20400521. The reversal of 20400498 is 89400402.

It can be written as a sum of positive squares in only one way, i.e., 12766329 + 7634169 = 3573^2 + 2763^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 62803 + ... + 63126.

Almost surely, 2^20400498 is an apocalyptic number.

20400498 is an abundant number, since it is smaller than the sum of its proper divisors (25312092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20400498 is a wasteful number, since it uses less digits than its factorization.

20400498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125943 (or 125934 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20400498 is about 4516.6910454447. The cubic root of 20400498 is about 273.2416650103.

The spelling of 20400498 in words is "twenty million, four hundred thousand, four hundred ninety-eight".