20021434 has 8 divisors (see below), whose sum is σ = 30188340. Its totient is φ = 9958656.

The previous prime is 20021429. The next prime is 20021467. The reversal of 20021434 is 43412002.

It can be written as a sum of positive squares in 2 ways, for example, as 17665209 + 2356225 = 4203^2 + 1535^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25549 + ... + 26320.

Almost surely, 2^20021434 is an apocalyptic number.

20021434 is a deficient number, since it is larger than the sum of its proper divisors (10166906).

20021434 is a wasteful number, since it uses less digits than its factorization.

20021434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52064.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20021434 is about 4474.5317073410. The cubic root of 20021434 is about 271.5386950852.

Adding to 20021434 its reverse (43412002), we get a palindrome (63433436).

The spelling of 20021434 in words is "twenty million, twenty-one thousand, four hundred thirty-four".