20954409 has 12 divisors (see below), whose sum is σ = 32500944. Its totient is φ = 11973864.

The previous prime is 20954399. The next prime is 20954413. The reversal of 20954409 is 90445902.

It is not a de Polignac number, because 20954409 - 2⁵ = 20954377 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20954409.

It is not an unprimeable number, because it can be changed into a prime (20954009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71127 + ... + 71420.

It is an arithmetic number, because the mean of its divisors is an integer number (2708412).

Almost surely, 2^20954409 is an apocalyptic number.

It is an amenable number.

20954409 is a deficient number, since it is larger than the sum of its proper divisors (11546535).

20954409 is a wasteful number, since it uses less digits than its factorization.

20954409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142564 (or 142557 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20954409 is about 4577.5986062563. The cubic root of 20954409 is about 275.6926188343.

The spelling of 20954409 in words is "twenty million, nine hundred fifty-four thousand, four hundred nine".