16220025 has 18 divisors (see below), whose sum is σ = 29052270. Its totient is φ = 8650560.

The previous prime is 16219981. The next prime is 16220069. The reversal of 16220025 is 52002261.

It is an interprime number because it is at equal distance from previous prime (16219981) and next prime (16220069).

It can be written as a sum of positive squares in 3 ways, for example, as 2359296 + 13860729 = 1536^2 + 3723^2 .

It is not a de Polignac number, because 16220025 - 2⁸ = 16219769 is a prime.

It is a super-2 number, since 2×16220025² = 526178422001250, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 35820 + ... + 36269.

It is an arithmetic number, because the mean of its divisors is an integer number (1614015).

Almost surely, 2^16220025 is an apocalyptic number.

16220025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16220025 is a deficient number, since it is larger than the sum of its proper divisors (12832245).

16220025 is a wasteful number, since it uses less digits than its factorization.

16220025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72105 (or 72097 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 16220025 is about 4027.4092168539. The cubic root of 16220025 is about 253.1340143109.

Adding to 16220025 its reverse (52002261), we get a palindrome (68222286).

The spelling of 16220025 in words is "sixteen million, two hundred twenty thousand, twenty-five".