20690520 has 32 divisors (see below), whose sum is σ = 62071920. Its totient is φ = 5517440.

The previous prime is 20690507. The next prime is 20690531. The reversal of 20690520 is 2509602.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86091 + ... + 86330.

Almost surely, 2^20690520 is an apocalyptic number.

20690520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20690520 is an abundant number, since it is smaller than the sum of its proper divisors (41381400).

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

20690520 is a wasteful number, since it uses less digits than its factorization.

20690520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172435 (or 172431 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20690520 is about 4548.6833259747. The cubic root of 20690520 is about 274.5304162367.

The spelling of 20690520 in words is "twenty million, six hundred ninety thousand, five hundred twenty".