20172402 has 24 divisors (see below), whose sum is σ = 45326736. Its totient is φ = 6723972.

The previous prime is 20172401. The next prime is 20172407. The reversal of 20172402 is 20427102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20172401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20268 + ... + 21239.

It is an arithmetic number, because the mean of its divisors is an integer number (1888614).

Almost surely, 2^20172402 is an apocalyptic number.

20172402 is an abundant number, since it is smaller than the sum of its proper divisors (25154334).

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

20172402 is an equidigital number, since it uses as much as digits as its factorization.

20172402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41524 (or 41512 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 20172402 is about 4491.3697242601. The cubic root of 20172402 is about 272.2194829533.

Adding to 20172402 its reverse (20427102), we get a palindrome (40599504).

The spelling of 20172402 in words is "twenty million, one hundred seventy-two thousand, four hundred two".