20907469 has 12 divisors (see below), whose sum is σ = 23173920. Its totient is φ = 18847400.

The previous prime is 20907457. The next prime is 20907517. The reversal of 20907469 is 96470902.

It is a de Polignac number, because none of the positive numbers 2^k-20907469 is a prime.

It is a super-2 number, since 2×20907469² = 874244519971922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20907409) 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, 15192 + ... + 16510.

It is an arithmetic number, because the mean of its divisors is an integer number (1931160).

Almost surely, 2^20907469 is an apocalyptic number.

It is an amenable number.

20907469 is a deficient number, since it is larger than the sum of its proper divisors (2266451).

20907469 is a wasteful number, since it uses less digits than its factorization.

20907469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472 (or 1461 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 20907469 is about 4572.4685892852. The cubic root of 20907469 is about 275.4866051241.

It can be divided in two parts, 2090 and 7469, that added together give a palindrome (9559).

The spelling of 20907469 in words is "twenty million, nine hundred seven thousand, four hundred sixty-nine".