20945496 has 128 divisors (see below), whose sum is σ = 65318400. Its totient is φ = 5498880.

The previous prime is 20945489. The next prime is 20945521. The reversal of 20945496 is 69454902.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58165 + ... + 58523.

It is an arithmetic number, because the mean of its divisors is an integer number (510300).

Almost surely, 2^20945496 is an apocalyptic number.

20945496 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20945496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32659200).

20945496 is an abundant number, since it is smaller than the sum of its proper divisors (44372904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20945496 is a wasteful number, since it uses less digits than its factorization.

20945496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 20945496 is about 4576.6249573239. The cubic root of 20945496 is about 275.6535244876.

The spelling of 20945496 in words is "twenty million, nine hundred forty-five thousand, four hundred ninety-six".