20013620 has 24 divisors (see below), whose sum is σ = 45849888. Its totient is φ = 7277600.

The previous prime is 20013613. The next prime is 20013659. The reversal of 20013620 is 2631002.

It is a junction number, because it is equal to n+sod(n) for n = 20013595 and 20013604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45266 + ... + 45705.

It is an arithmetic number, because the mean of its divisors is an integer number (1910412).

Almost surely, 2^20013620 is an apocalyptic number.

20013620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20013620 is an abundant number, since it is smaller than the sum of its proper divisors (25836268).

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

20013620 is a wasteful number, since it uses less digits than its factorization.

20013620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90991 (or 90989 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20013620 is about 4473.6584581302. The cubic root of 20013620 is about 271.5033649576.

Adding to 20013620 its reverse (2631002), we get a palindrome (22644622).

The spelling of 20013620 in words is "twenty million, thirteen thousand, six hundred twenty".