20690544 has 120 divisors (see below), whose sum is σ = 65591040. Its totient is φ = 5588352.

The previous prime is 20690539. The next prime is 20690591. The reversal of 20690544 is 44509602.

It is a super-2 number, since 2×20690544² = 856197222031872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44457 + ... + 44919.

It is an arithmetic number, because the mean of its divisors is an integer number (546592).

Almost surely, 2^20690544 is an apocalyptic number.

20690544 is a gapful number since it is divisible by the number (24) 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 20690544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32795520).

20690544 is an abundant number, since it is smaller than the sum of its proper divisors (44900496).

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

20690544 is a wasteful number, since it uses less digits than its factorization.

20690544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 20690544 is about 4548.6859641000. The cubic root of 20690544 is about 274.5305223840.

The spelling of 20690544 in words is "twenty million, six hundred ninety thousand, five hundred forty-four".