20041778 has 4 divisors (see below), whose sum is σ = 30062670. Its totient is φ = 10020888.

The previous prime is 20041771. The next prime is 20041783. The reversal of 20041778 is 87714002.

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., 19035769 + 1006009 = 4363^2 + 1003^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20041778.

It is not an unprimeable number, because it can be changed into a prime (20041771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010443 + ... + 5010446.

Almost surely, 2^20041778 is an apocalyptic number.

20041778 is a deficient number, since it is larger than the sum of its proper divisors (10020892).

20041778 is a wasteful number, since it uses less digits than its factorization.

20041778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10020891.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 20041778 is about 4476.8044406697. The cubic root of 20041778 is about 271.6306351065.

The spelling of 20041778 in words is "twenty million, forty-one thousand, seven hundred seventy-eight".