20191939210 has 64 divisors (see below), whose sum is σ = 39093062400. Its totient is φ = 7481635840.

The previous prime is 20191939123. The next prime is 20191939213. The reversal of 20191939210 is 1293919102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20191939210.

It is not an unprimeable number, because it can be changed into a prime (20191939213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9618741 + ... + 9620839.

It is an arithmetic number, because the mean of its divisors is an integer number (610829100).

Almost surely, 2^20191939210 is an apocalyptic number.

20191939210 is a deficient number, since it is larger than the sum of its proper divisors (18901123190).

20191939210 is a wasteful number, since it uses less digits than its factorization.

20191939210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991.

The product of its (nonzero) digits is 8748, while the sum is 37.

The spelling of 20191939210 in words is "twenty billion, one hundred ninety-one million, nine hundred thirty-nine thousand, two hundred ten".