20945019 has 8 divisors (see below), whose sum is σ = 29140992. Its totient is φ = 13356200.

The previous prime is 20944981. The next prime is 20945039. The reversal of 20945019 is 91054902.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20945019 - 2¹³ = 20936827 is a prime.

It is a super-2 number, since 2×20945019² = 877387641820722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20945039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151707 + ... + 151844.

It is an arithmetic number, because the mean of its divisors is an integer number (3642624).

Almost surely, 2^20945019 is an apocalyptic number.

20945019 is a deficient number, since it is larger than the sum of its proper divisors (8195973).

20945019 is a wasteful number, since it uses less digits than its factorization.

20945019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303577.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20945019 is about 4576.5728443891. The cubic root of 20945019 is about 275.6514319497.

The spelling of 20945019 in words is "twenty million, nine hundred forty-five thousand, nineteen".