20420354 has 4 divisors (see below), whose sum is σ = 30630534. Its totient is φ = 10210176.

The previous prime is 20420347. The next prime is 20420357. The reversal of 20420354 is 45302402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12439729 + 7980625 = 3527^2 + 2825^2 .

It is not an unprimeable number, because it can be changed into a prime (20420357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105087 + ... + 5105090.

Almost surely, 2^20420354 is an apocalyptic number.

20420354 is a deficient number, since it is larger than the sum of its proper divisors (10210180).

20420354 is a wasteful number, since it uses less digits than its factorization.

20420354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10210179.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20420354 is about 4518.8885801710. Note that the first 3 decimals coincide. The cubic root of 20420354 is about 273.3302858408.

Adding to 20420354 its reverse (45302402), we get a palindrome (65722756).

The spelling of 20420354 in words is "twenty million, four hundred twenty thousand, three hundred fifty-four".