20553402 has 32 divisors (see below), whose sum is σ = 44769600. Its totient is φ = 6265728.

The previous prime is 20553361. The next prime is 20553433. The reversal of 20553402 is 20435502.

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, 198 + ... + 6414.

It is an arithmetic number, because the mean of its divisors is an integer number (1399050).

Almost surely, 2^20553402 is an apocalyptic number.

20553402 is an abundant number, since it is smaller than the sum of its proper divisors (24216198).

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

20553402 is a wasteful number, since it uses less digits than its factorization.

20553402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6270.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20553402 is about 4533.5859978609. The cubic root of 20553402 is about 273.9226254253.

Adding to 20553402 its reverse (20435502), we get a palindrome (40988904).

The spelling of 20553402 in words is "twenty million, five hundred fifty-three thousand, four hundred two".