20631602 has 4 divisors (see below), whose sum is σ = 30947406. Its totient is φ = 10315800.

The previous prime is 20631601. The next prime is 20631617. The reversal of 20631602 is 20613602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20613602 = 2 ⋅10306801.

It can be written as a sum of positive squares in only one way, i.e., 13184161 + 7447441 = 3631^2 + 2729^2 .

It is not an unprimeable number, because it can be changed into a prime (20631601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5157899 + ... + 5157902.

Almost surely, 2^20631602 is an apocalyptic number.

20631602 is a deficient number, since it is larger than the sum of its proper divisors (10315804).

20631602 is a wasteful number, since it uses less digits than its factorization.

20631602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10315803.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20631602 is about 4542.2023292672. The cubic root of 20631602 is about 274.2695856660.

The spelling of 20631602 in words is "twenty million, six hundred thirty-one thousand, six hundred two".