20011698 has 60 divisors (see below), whose sum is σ = 52182702. Its totient is φ = 5715360.

The previous prime is 20011697. The next prime is 20011699. The reversal of 20011698 is 89611002.

It is an interprime number because it is at equal distance from previous prime (20011697) and next prime (20011699).

It can be written as a sum of positive squares in only one way, i.e., 20007729 + 3969 = 4473^2 + 63^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20011697) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 6678 + ... + 9198.

Almost surely, 2^20011698 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20011698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26091351).

20011698 is an abundant number, since it is smaller than the sum of its proper divisors (32171004).

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

20011698 is a wasteful number, since it uses less digits than its factorization.

20011698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2549 (or 2533 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 20011698 is about 4473.4436399713. The cubic root of 20011698 is about 271.4946734403.

The spelling of 20011698 in words is "twenty million, eleven thousand, six hundred ninety-eight".