19977950 has 24 divisors (see below), whose sum is σ = 38360640. Its totient is φ = 7732800.

The previous prime is 19977943. The next prime is 19977953. The reversal of 19977950 is 5977991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19977895 and 19977904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19977953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4895 + ... + 7994.

It is an arithmetic number, because the mean of its divisors is an integer number (1598360).

Almost surely, 2^19977950 is an apocalyptic number.

19977950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19977950 is a deficient number, since it is larger than the sum of its proper divisors (18382690).

19977950 is a wasteful number, since it uses less digits than its factorization.

19977950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12932 (or 12927 counting only the distinct ones).

The product of its (nonzero) digits is 178605, while the sum is 47.

The square root of 19977950 is about 4469.6700101909. The cubic root of 19977950 is about 271.3419701297.

The spelling of 19977950 in words is "nineteen million, nine hundred seventy-seven thousand, nine hundred fifty".