20215409612720 has 40 divisors (see below), whose sum is σ = 53715231258144. Its totient is φ = 6930997581312.

The previous prime is 20215409612719. The next prime is 20215409612729. The reversal of 20215409612720 is 2721690451202.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (20215409612729) 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, 18049472309 + ... + 18049473428.

Almost surely, 2^{20215409612720} is an apocalyptic number.

20215409612720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20215409612720 is an abundant number, since it is smaller than the sum of its proper divisors (33499821645424).

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

20215409612720 is a wasteful number, since it uses less digits than its factorization.

20215409612720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36098945757 (or 36098945751 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 20215409612720 in words is "twenty trillion, two hundred fifteen billion, four hundred nine million, six hundred twelve thousand, seven hundred twenty".