20071390 has 32 divisors (see below), whose sum is σ = 39299904. Its totient is φ = 7349760.

The previous prime is 20071367. The next prime is 20071409. The reversal of 20071390 is 9317002.

20071390 = T₅₀ + T₅₁ + ... + T₄₉₃.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4695 + ... + 7885.

It is an arithmetic number, because the mean of its divisors is an integer number (1228122).

Almost surely, 2^20071390 is an apocalyptic number.

20071390 is a deficient number, since it is larger than the sum of its proper divisors (19228514).

20071390 is a wasteful number, since it uses less digits than its factorization.

20071390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 20071390 is about 4480.1104897089. The cubic root of 20071390 is about 271.7643485948.

Adding to 20071390 its reverse (9317002), we get a palindrome (29388392).

The spelling of 20071390 in words is "twenty million, seventy-one thousand, three hundred ninety".