20958636 has 24 divisors (see below), whose sum is σ = 49047040. Its totient is φ = 6965712.

The previous prime is 20958631. The next prime is 20958689. The reversal of 20958636 is 63685902.

It is a junction number, because it is equal to n+sod(n) for n = 20958594 and 20958603.

It is not an unprimeable number, because it can be changed into a prime (20958631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2025 + ... + 6783.

Almost surely, 2^20958636 is an apocalyptic number.

It is an amenable number.

20958636 is an abundant number, since it is smaller than the sum of its proper divisors (28088404).

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

20958636 is a wasteful number, since it uses less digits than its factorization.

20958636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5133 (or 5131 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 20958636 is about 4578.0602879386. The cubic root of 20958636 is about 275.7111554956.

It can be divided in two parts, 2095 and 8636, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 20958636 in words is "twenty million, nine hundred fifty-eight thousand, six hundred thirty-six".