20454545 has 16 divisors (see below), whose sum is σ = 26040000. Its totient is φ = 15380928.

The previous prime is 20454529. The next prime is 20454547. The reversal of 20454545 is 54545402.

It is a cyclic number.

It is not a de Polignac number, because 20454545 - 2⁴ = 20454529 is a prime.

It is a super-2 number, since 2×20454545² = 836776822314050, which contains 22 as substring.

20454545 is a modest number, since divided by 4545 gives 2045 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20454547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12431 + ... + 13979.

It is an arithmetic number, because the mean of its divisors is an integer number (1627500).

Almost surely, 2^20454545 is an apocalyptic number.

It is an amenable number.

20454545 is a deficient number, since it is larger than the sum of its proper divisors (5585455).

20454545 is a wasteful number, since it uses less digits than its factorization.

20454545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712.

The product of its (nonzero) digits is 16000, while the sum is 29.

The square root of 20454545 is about 4522.6701184146. The cubic root of 20454545 is about 273.4827517706.

Adding to 20454545 its reverse (54545402), we get a palindrome (74999947).

The spelling of 20454545 in words is "twenty million, four hundred fifty-four thousand, five hundred forty-five".