20672155 has 16 divisors (see below), whose sum is σ = 28647360. Its totient is φ = 14026752.

The previous prime is 20672131. The next prime is 20672227. The reversal of 20672155 is 55127602.

It is a cyclic number.

It is not a de Polignac number, because 20672155 - 2⁵ = 20672123 is a prime.

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, 351 + ... + 6439.

It is an arithmetic number, because the mean of its divisors is an integer number (1790460).

Almost surely, 2^20672155 is an apocalyptic number.

20672155 is a deficient number, since it is larger than the sum of its proper divisors (7975205).

20672155 is an equidigital number, since it uses as much as digits as its factorization.

20672155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6198.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 20672155 is about 4546.6641617784. The cubic root of 20672155 is about 274.4491673761.

Adding to 20672155 its reverse (55127602), we get a palindrome (75799757).

It can be divided in two parts, 206 and 72155, that added together give a square (72361 = 269²).

The spelling of 20672155 in words is "twenty million, six hundred seventy-two thousand, one hundred fifty-five".