20695290 has 192 divisors, whose sum is σ = 67903488. Its totient is φ = 3916800.

The previous prime is 20695289. The next prime is 20695309. The reversal of 20695290 is 9259602.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 667575 + ... + 667605.

It is an arithmetic number, because the mean of its divisors is an integer number (353664).

Almost surely, 2^20695290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20695290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33951744).

20695290 is an abundant number, since it is smaller than the sum of its proper divisors (47208198).

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

20695290 is a wasteful number, since it uses less digits than its factorization.

20695290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 20695290 is about 4549.2076233120. The cubic root of 20695290 is about 274.5515113963.

The spelling of 20695290 in words is "twenty million, six hundred ninety-five thousand, two hundred ninety".