1020157794 has 32 divisors (see below), whose sum is σ = 2400373440. Its totient is φ = 320049216.

The previous prime is 1020157793. The next prime is 1020157819. The reversal of 1020157794 is 4977510201.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1020157793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 554724 + ... + 556559.

It is an arithmetic number, because the mean of its divisors is an integer number (75011670).

Almost surely, 2^1020157794 is an apocalyptic number.

1020157794 is an abundant number, since it is smaller than the sum of its proper divisors (1380215646).

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

1020157794 is a wasteful number, since it uses less digits than its factorization.

1020157794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111311 (or 1111305 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 1020157794 is about 31939.9091107035. The cubic root of 1020157794 is about 1006.6746150613.

Adding to 1020157794 its reverse (4977510201), we get a palindrome (5997667995).

The spelling of 1020157794 in words is "one billion, twenty million, one hundred fifty-seven thousand, seven hundred ninety-four".