20294731658 has 4 divisors (see below), whose sum is σ = 30442097490. Its totient is φ = 10147365828.

The previous prime is 20294731621. The next prime is 20294731673. The reversal of 20294731658 is 85613749202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16561888249 + 3732843409 = 128693^2 + 61097^2 .

It is a super-2 number, since 2×20294731658² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5073682913 + ... + 5073682916.

It is a 1-persistent number, because it is pandigital, but 2⋅20294731658 = 40589463316 is not.

Almost surely, 2^20294731658 is an apocalyptic number.

20294731658 is a deficient number, since it is larger than the sum of its proper divisors (10147365832).

20294731658 is a wasteful number, since it uses less digits than its factorization.

20294731658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10147365831.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 20294731658 in words is "twenty billion, two hundred ninety-four million, seven hundred thirty-one thousand, six hundred fifty-eight".