20173402 has 12 divisors (see below), whose sum is σ = 31937706. Its totient is φ = 9555480.

The previous prime is 20173397. The next prime is 20173409. The reversal of 20173402 is 20437102.

It can be written as a sum of positive squares in only one way, i.e., 17313921 + 2859481 = 4161^2 + 1691^2 .

It is a super-2 number, since 2×20173402² = 813932296507208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 20173402.

It is not an unprimeable number, because it can be changed into a prime (20173409) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 13249 + ... + 14692.

Almost surely, 2^20173402 is an apocalyptic number.

20173402 is a deficient number, since it is larger than the sum of its proper divisors (11764304).

20173402 is a wasteful number, since it uses less digits than its factorization.

20173402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27981 (or 27962 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20173402 is about 4491.4810474942. The cubic root of 20173402 is about 272.2239810953.

The spelling of 20173402 in words is "twenty million, one hundred seventy-three thousand, four hundred two".