20511148 has 12 divisors (see below), whose sum is σ = 41022352. Its totient is φ = 8790480.

The previous prime is 20511143. The next prime is 20511157. The reversal of 20511148 is 84111502.

It is a Cunningham number, because it is equal to 29⁵-1.

20511148 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20511143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366243 + ... + 366298.

Almost surely, 2^20511148 is an apocalyptic number.

20511148 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20511148 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20511148 is a wasteful number, since it uses less digits than its factorization.

20511148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732552 (or 732550 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 20511148 is about 4528.9234923986. The cubic root of 20511148 is about 273.7347851958.

The spelling of 20511148 in words is "twenty million, five hundred eleven thousand, one hundred forty-eight".