20154402 has 48 divisors (see below), whose sum is σ = 47473920. Its totient is φ = 6156000.

The previous prime is 20154389. The next prime is 20154403. The reversal of 20154402 is 20445102.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20154403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9652 + ... + 11552.

It is an arithmetic number, because the mean of its divisors is an integer number (989040).

Almost surely, 2^20154402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20154402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23736960).

20154402 is an abundant number, since it is smaller than the sum of its proper divisors (27319518).

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

20154402 is a wasteful number, since it uses less digits than its factorization.

20154402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959 (or 1956 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20154402 is about 4489.3654340007. The cubic root of 20154402 is about 272.1384909650.

Adding to 20154402 its reverse (20445102), we get a palindrome (40599504).

The spelling of 20154402 in words is "twenty million, one hundred fifty-four thousand, four hundred two".