20442836 has 6 divisors (see below), whose sum is σ = 35774970. Its totient is φ = 10221416.

The previous prime is 20442827. The next prime is 20442853. The reversal of 20442836 is 63824402.

It can be written as a sum of positive squares in only one way, i.e., 16810000 + 3632836 = 4100^2 + 1906^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20442799 and 20442808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2555351 + ... + 2555358.

It is an arithmetic number, because the mean of its divisors is an integer number (5962495).

Almost surely, 2^20442836 is an apocalyptic number.

It is an amenable number.

20442836 is a deficient number, since it is larger than the sum of its proper divisors (15332134).

20442836 is a wasteful number, since it uses less digits than its factorization.

20442836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5110713 (or 5110711 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 20442836 is about 4521.3754544386. The cubic root of 20442836 is about 273.4305576534.

The spelling of 20442836 in words is "twenty million, four hundred forty-two thousand, eight hundred thirty-six".