20243885 has 16 divisors (see below), whose sum is σ = 25326000. Its totient is φ = 15515136.

The previous prime is 20243879. The next prime is 20243891. The reversal of 20243885 is 58834202.

20243885 = T₄₄₅ + T₄₄₆ + ... + T₅₉₃.

20243885 = 3181² + 3182².

It is an interprime number because it is at equal distance from previous prime (20243879) and next prime (20243891).

It can be written as a sum of positive squares in 8 ways, for example, as 5597956 + 14645929 = 2366^2 + 3827^2 .

It is a cyclic number.

It is not a de Polignac number, because 20243885 - 2¹⁰ = 20242861 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21137 + ... + 22073.

It is an arithmetic number, because the mean of its divisors is an integer number (1582875).

Almost surely, 2^20243885 is an apocalyptic number.

20243885 is the 3182-nd centered square number.

It is an amenable number.

20243885 is a deficient number, since it is larger than the sum of its proper divisors (5082115).

20243885 is a wasteful number, since it uses less digits than its factorization.

20243885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 20243885 is about 4499.3205042539. The cubic root of 20243885 is about 272.5406498851.

The spelling of 20243885 in words is "twenty million, two hundred forty-three thousand, eight hundred eighty-five".