20672455 has 16 divisors (see below), whose sum is σ = 25701984. Its totient is φ = 15949440.

The previous prime is 20672441. The next prime is 20672461. The reversal of 20672455 is 55427602.

It is not a de Polignac number, because 20672455 - 2¹⁷ = 20541383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23809 + ... + 24661.

It is an arithmetic number, because the mean of its divisors is an integer number (1606374).

Almost surely, 2^20672455 is an apocalyptic number.

20672455 is a deficient number, since it is larger than the sum of its proper divisors (5029529).

20672455 is a wasteful number, since it uses less digits than its factorization.

20672455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 20672455 is about 4546.6971528792. The cubic root of 20672455 is about 274.4504949970.

It can be divided in two parts, 2067245 and 5, that multiplied together give a square (10336225 = 3215²).

The spelling of 20672455 in words is "twenty million, six hundred seventy-two thousand, four hundred fifty-five".