20686701 has 16 divisors (see below), whose sum is σ = 31653504. Its totient is φ = 11771904.

The previous prime is 20686693. The next prime is 20686709. The reversal of 20686701 is 10768602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20686693) and next prime (20686709).

It is not a de Polignac number, because 20686701 - 2³ = 20686693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3481 + ... + 7313.

It is an arithmetic number, because the mean of its divisors is an integer number (1978344).

Almost surely, 2^20686701 is an apocalyptic number.

20686701 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20686701 is a deficient number, since it is larger than the sum of its proper divisors (10966803).

20686701 is a wasteful number, since it uses less digits than its factorization.

20686701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4100.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20686701 is about 4548.2635147933. The cubic root of 20686701 is about 274.5135245044.

The spelling of 20686701 in words is "twenty million, six hundred eighty-six thousand, seven hundred one".