20415645401456 has 20 divisors (see below), whose sum is σ = 40919289275400. Its totient is φ = 9855828814272.

The previous prime is 20415645401399. The next prime is 20415645401507. The reversal of 20415645401456 is 65410454651402.

It is a self number, because there is not a number n which added to its sum of digits gives 20415645401456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21999617426 + ... + 21999618353.

It is an arithmetic number, because the mean of its divisors is an integer number (2045964463770).

Almost surely, 2^{20415645401456} is an apocalyptic number.

It is an amenable number.

20415645401456 is an abundant number, since it is smaller than the sum of its proper divisors (20503643873944).

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

20415645401456 is a wasteful number, since it uses less digits than its factorization.

20415645401456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43999235816 (or 43999235810 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 47.

The spelling of 20415645401456 in words is "twenty trillion, four hundred fifteen billion, six hundred forty-five million, four hundred one thousand, four hundred fifty-six".