20615013900 has 216 divisors, whose sum is σ = 69791269184. Its totient is φ = 5059584000.

The previous prime is 20615013893. The next prime is 20615013901. The reversal of 20615013900 is 931051602.

It is not an unprimeable number, because it can be changed into a prime (20615013901) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4291500 + ... + 4296300.

Almost surely, 2^20615013900 is an apocalyptic number.

20615013900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20615013900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34895634592).

20615013900 is an abundant number, since it is smaller than the sum of its proper divisors (49176255284).

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

20615013900 is a wasteful number, since it uses less digits than its factorization.

20615013900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5201 (or 5191 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The spelling of 20615013900 in words is "twenty billion, six hundred fifteen million, thirteen thousand, nine hundred".