20192640 has 128 divisors (see below), whose sum is σ = 69400800. Its totient is φ = 4964352.

The previous prime is 20192633. The next prime is 20192677. The reversal of 20192640 is 4629102.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is a self number, because there is not a number n which added to its sum of digits gives 20192640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24556 + ... + 25364.

Almost surely, 2^20192640 is an apocalyptic number.

20192640 is a gapful number since it is divisible by the number (20) 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 20192640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34700400).

20192640 is an abundant number, since it is smaller than the sum of its proper divisors (49208160).

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

20192640 is a wasteful number, since it uses less digits than its factorization.

20192640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844 (or 832 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20192640 is about 4493.6221469990. The cubic root of 20192640 is about 272.3104874282.

The spelling of 20192640 in words is "twenty million, one hundred ninety-two thousand, six hundred forty".