1020155020400 has 60 divisors (see below), whose sum is σ = 2453323930344. Its totient is φ = 407662176000.

The previous prime is 1020155020393. The next prime is 1020155020427. The reversal of 1020155020400 is 40205510201.

1020155020400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 840566 + ... + 1657365.

Almost surely, 2^{1020155020400} is an apocalyptic number.

1020155020400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020155020400 is an abundant number, since it is smaller than the sum of its proper divisors (1433168909944).

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

1020155020400 is a wasteful number, since it uses less digits than its factorization.

1020155020400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2498970 (or 2498959 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The spelling of 1020155020400 in words is "one trillion, twenty billion, one hundred fifty-five million, twenty thousand, four hundred".