20435642 has 4 divisors (see below), whose sum is σ = 30653466. Its totient is φ = 10217820.

The previous prime is 20435629. The next prime is 20435651. The reversal of 20435642 is 24653402.

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., 12823561 + 7612081 = 3581^2 + 2759^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5108909 + ... + 5108912.

Almost surely, 2^20435642 is an apocalyptic number.

20435642 is a deficient number, since it is larger than the sum of its proper divisors (10217824).

20435642 is a wasteful number, since it uses less digits than its factorization.

20435642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10217823.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 20435642 is about 4520.5798300661. The cubic root of 20435642 is about 273.3984797457.

The spelling of 20435642 in words is "twenty million, four hundred thirty-five thousand, six hundred forty-two".