20400146 has 32 divisors (see below), whose sum is σ = 34328448. Its totient is φ = 9031680.

The previous prime is 20400101. The next prime is 20400151. The reversal of 20400146 is 64100402.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79250 + ... + 79506.

It is an arithmetic number, because the mean of its divisors is an integer number (1072764).

Almost surely, 2^20400146 is an apocalyptic number.

20400146 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20400146 is a deficient number, since it is larger than the sum of its proper divisors (13928302).

20400146 is a wasteful number, since it uses less digits than its factorization.

20400146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20400146 is about 4516.6520786972. The cubic root of 20400146 is about 273.2400934536.

Adding to 20400146 its reverse (64100402), we get a palindrome (84500548).

The spelling of 20400146 in words is "twenty million, four hundred thousand, one hundred forty-six".