20901455 has 8 divisors (see below), whose sum is σ = 25129104. Its totient is φ = 16689600.

The previous prime is 20901437. The next prime is 20901469. The reversal of 20901455 is 55410902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20901455 - 2¹⁴ = 20885071 is a prime.

It is a super-2 number, since 2×20901455² = 873741642234050, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 806 + ... + 6515.

It is an arithmetic number, because the mean of its divisors is an integer number (3141138).

Almost surely, 2^20901455 is an apocalyptic number.

20901455 is a deficient number, since it is larger than the sum of its proper divisors (4227649).

20901455 is an equidigital number, since it uses as much as digits as its factorization.

20901455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7897.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20901455 is about 4571.8109103505. The cubic root of 20901455 is about 275.4601881640.

The spelling of 20901455 in words is "twenty million, nine hundred one thousand, four hundred fifty-five".